Add live Azure DevOps test result publishing

[Evangelink]

Part 1 of the brainstorm in #5951 — adds opt-in live test-result publishing to the Azure DevOps Tests tab via the REST API. No Microsoft.TeamFoundationServer.Client dependency; just HttpClient + System.Text.Json.

One of three PRs derived from the #5951 brainstorm. The others:

• Auto-upload test artifacts and build tags to Azure DevOps #8295 — Auto-upload test artifacts and build tags (pipeline-level)
• Flaky-history annotations + quarantine awareness (coming)

See issue comment for the broader plan.

Why

Today, getting results into the AzDO Tests tab requires generating a TRX and adding a downstream PublishTestResults@2 task. Two real problems:

1. Long pipelines can't see what passed/failed until the very end.
2. Parallel jobs race on TRX uploads.

This PR publishes results to a single AzDO run as tests finish, with no TRX dependency.

What

Two new opt-in CLI options on Microsoft.Testing.Extensions.AzureDevOpsReport:

Option	Type	Purpose
--publish-azdo-test-results	zero-arity	Enable live publishing. Auto-no-op (with warning) if any of SYSTEM_ACCESSTOKEN / SYSTEM_COLLECTIONURI / SYSTEM_TEAMPROJECT is missing.
--publish-azdo-run-name <name>	string	Override the run name. Default: <assembly> (<tfm>) on <agent> (or <stage>/<job> when present, sanitized). Requires --publish-azdo-test-results.

Wired into the existing AddAzureDevOpsProvider() — no new public API.

How it works

• Auth — Authorization: Basic base64(":<SYSTEM_ACCESSTOKEN>") (AzDO's standard PAT-as-basic-auth pattern). Token never logged.
• Run lifecycle — POST {project}/_apis/test/runs?api-version=7.1 at session start, batched POST .../results?api-version=7.1 as TestNodeUpdateMessages flow in, PATCH .../runs/{id}?api-version=7.1 to Completed (or Aborted on cancellation) at session end.
• Batching — flush at 100 results or every 5s, with a global semaphore guaranteeing one in-flight POST per run.
• Multi-process — AzureDevOpsRunIdCoordinator writes a azdo-runid.<buildId>.{owner,json,participant.<pid>.json} set under TestResultsDirectory. The first process creates the run; joiners read the id and publish into the same run. The owner waits for participants to drain (bounded timeout, defaults to 30s) before finalizing.
• Resilience — REST calls retry on HttpRequestException, IOException, SocketException, and TaskCanceledException (3 attempts, exponential backoff, 429 honors Retry-After). All callbacks catch Exception ex when ex is not OperationCanceledException and log a warning — publishing failures never fail the test run.
• HttpClient — single static instance with a 30s Timeout and per-request linked CancellationTokenSource (15s).

Highlights from the expert-reviewer round

Implementation went through one full round of expert-reviewer. Critical/major issues addressed:

• C1: bounded FinalizeRunAsync wait (no infinite hang on recycled PIDs).
• C2: stale azdo-runid.json from a prior build no longer poisons the next build (ExpiresAt validated; coordination filenames keyed by BUILD_BUILDID; owner failures clean up the owner file).
• C3: participant marker race fixed — owner also writes its own marker; existing marker file is overwritten rather than silently dropped.
• C4: broadened catches to Exception ex when ex is not OperationCanceledException so JsonException/IOException/SocketException no longer escape IDataConsumer callbacks.
• C5: finite HttpClient.Timeout + per-request linked CTS — eliminates publisher-wide deadlock on a hung endpoint.
• M1: _lastFlushTime is now long ticks + Interlocked.Read/Exchange (no torn DateTimeOffset reads).
• M2: flush loop now drains the queue past the threshold while holding the semaphore.
• M4: cancellation-aware ReadAsByteArrayAsync(ct) / ReadAsStringAsync(ct) under #if NET.
• M6: retry predicate widened to HttpRequestException or IOException or SocketException or TaskCanceledException.
• M7: explicit [JsonPropertyName] on every wire DTO (request and response).
• M9: automatedTestStorage now strips the extension so it matches legacy TRX-uploaded history keys.
• M10/M11: tests use Environment.ProcessId / int.MaxValue for alive/dead PIDs and unique temp dirs under Path.GetTempPath() with cleanup-on-failure.

Owner re-election on owner-process crash is deferred behind a clear TODO (AzureDevOpsRunIdCoordinator.cs) with periodic lease renewal so a clean run never trips the bounded wait.

Tests

127 unit tests pass. New coverage in test/UnitTests/Microsoft.Testing.Extensions.UnitTests/AzureDevOpsLivePublishingTests.cs:

• Run creation and id persistence.
• Result-batch flush at size and time thresholds, plus session-end forced flush.
• State mapping (Passed / Failed / Skipped / Timeout / Cancelled / Error).
• 429 retry honors Retry-After.
• Network/JSON failure → warning logged, session continues normally.
• Run-id coordinator: create, join (multi-process), expired-file rejection, BuildId mismatch rejection.
• Owner finalize bounded wait.

HelpInfoAllExtensionsTests expectations updated for the new options (both --help and --info blocks, alphabetical order preserved).

Build status (local)

• .\.dotnet\dotnet.exe build src\Platform\Microsoft.Testing.Extensions.AzureDevOpsReport\Microsoft.Testing.Extensions.AzureDevOpsReport.csproj -c Debug — 0 warnings, 0 errors.
• .\.dotnet\dotnet.exe test test\UnitTests\Microsoft.Testing.Extensions.UnitTests\Microsoft.Testing.Extensions.UnitTests.csproj — 127/127 passed.
• .\build.cmd -pack — 0 warnings, 0 errors.

Out of scope (deliberate)

• Result-level attachments (attach dumps / screenshots / coverage to their failing test in the AzDO Tests tab) — small follow-up on top of this PR's REST client.
• Azure Test Plans integration / test-case association (Investigate test case association feature and its support with MTP #4477) — separate package.

Checklist

• Critical & Major review findings addressed
• Localized via resx + xlf (regenerated with /t:UpdateXlf, not hand-edited)
• Help/info acceptance test expectations updated
• No new public API
• .\build.cmd green (0 warnings, 0 errors)
• Owner re-election on crash (deferred — TODO with lease renewal in place)
• PR feedback addressed

Refs #5951

[Copilot]

Pull request overview

Adds opt-in live Azure DevOps test-result publishing to the existing Azure DevOps reporting extension, using REST APIs plus multi-process run coordination.

Changes:

• Adds new --publish-azdo-* CLI options and wires the live publisher into AddAzureDevOpsProvider().
• Implements REST client, result batching, run-id coordination, and localized resource strings.
• Adds unit coverage and updates all-extensions help/info expectations.

Show a summary per file

File	Description
Directory.Packages.props	Adds System.Text.Json package version.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Microsoft.Testing.Extensions.AzureDevOpsReport.csproj	References System.Text.Json.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/AzureDevOpsCommandLineOptions.cs	Adds live publishing option names.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/AzureDevOpsCommandLineProvider.cs	Registers and validates new CLI options.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/AzureDevOpsExtensions.cs	Wires publisher as data consumer and session lifetime handler.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/AzureDevOpsLivePublishingModels.cs	Adds live publishing constants and DTOs.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/AzureDevOpsRunIdCoordinator.cs	Adds multi-process run-id coordination.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/AzureDevOpsTestResultsClient.cs	Adds Azure DevOps REST client.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/AzureDevOpsTestResultsPublisher.cs	Adds live result publishing lifecycle and batching.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/IAzureDevOpsTestResultsClient.cs	Adds internal client abstraction.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/AzureDevOpsResources.resx	Adds localized strings for options and warnings.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.cs.xlf	Updates Czech localization resources.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.de.xlf	Updates German localization resources.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.es.xlf	Updates Spanish localization resources.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.fr.xlf	Updates French localization resources.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.it.xlf	Updates Italian localization resources.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.ja.xlf	Updates Japanese localization resources.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.ko.xlf	Updates Korean localization resources.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.pl.xlf	Updates Polish localization resources.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.pt-BR.xlf	Updates Portuguese localization resources.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.ru.xlf	Updates Russian localization resources.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.tr.xlf	Updates Turkish localization resources.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.zh-Hans.xlf	Updates Simplified Chinese localization resources.
src/Platform/Microsoft.Testing.Extensions.AzureDevOpsReport/Resources/xlf/AzureDevOpsResources.zh-Hant.xlf	Updates Traditional Chinese localization resources.
test/IntegrationTests/Microsoft.Testing.Platform.Acceptance.IntegrationTests/HelpInfoAllExtensionsTests.cs	Updates help/info expectations for new options.
test/UnitTests/Microsoft.Testing.Extensions.UnitTests/AzureDevOpsLivePublishingTests.cs	Adds live publishing unit tests.

Copilot's findings

• Files reviewed: 26/26 changed files
• Comments generated: 6