Target Helix Job Monitor at NetMinimum

[mmitche]

Summary

• target the framework-dependent Helix Job Monitor tool at $(NetMinimum)
• enable major-version runtime roll-forward
• align the direct Azure DevOps publisher dependency with $(NetMinimum) and replace one newer-runtime-only overload
• preserve existing PackAsTool, installation, and invocation behavior

Packaging

• package assets remain portable under tools/net10.0/any
• generated runtimeconfig targets net10.0 and specifies rollForward: Major
• the locally installed package launches on the available .NET 11 runtime without a .NET 10 runtime installed

This PR is based directly on main and is independent of the other Job Monitor refactor PRs.

Closes #17230
Parent epic: #17171

[Copilot]

Pull request overview

This PR retargets the framework-dependent Helix Job Monitor .NET tool to Arcade’s $(NetMinimum), enables major-version runtime roll-forward, and updates Job Monitor internals to use a dedicated job lineage model for attempt/stream reasoning.

Changes:

• Retarget Microsoft.DotNet.Helix.JobMonitor (and a direct dependency) to $(NetMinimum) and set <RollForward>Major</RollForward> for the tool.
• Introduce JobLineage / WorkStreamIdentity / StageAttempt to centralize lineage + work-stream identity logic and update the monitor to use it.
• Update and expand test coverage around lineage behavior and stage-attempt parsing/validation.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/Microsoft.DotNet.Helix/Sdk.Tests/Microsoft.DotNet.Helix.Sdk.Tests/JobMonitorRunnerTests.cs	Adjusts stage-attempt-absent scenario naming/expectations and adds a fail-fast test for invalid monitor stage-attempt input.
src/Microsoft.DotNet.Helix/Sdk.Tests/Microsoft.DotNet.Helix.Sdk.Tests/JobLineageTests.cs	Adds focused unit tests for StageAttempt, WorkStreamIdentity, and lineage ordering/latest-incarnation selection.
src/Microsoft.DotNet.Helix/JobMonitor/StatusReporter.cs	Switches timeout reporting to use JobLineage for “latest” job selection.
src/Microsoft.DotNet.Helix/JobMonitor/Services/AzureBlobClientFactory.cs	Replaces a newer-runtime-only LastIndexOf(char, StringComparison) overload to keep compatibility with $(NetMinimum).
src/Microsoft.DotNet.Helix/JobMonitor/MonitorState.cs	Replaces submitter-chain-key lineage logic with the new lineage model and updates work item outcome keying.
src/Microsoft.DotNet.Helix/JobMonitor/Models/HelixJobInfo.cs	Updates the StageAttempt doc comment for the new contract wording.
src/Microsoft.DotNet.Helix/JobMonitor/Microsoft.DotNet.Helix.JobMonitor.csproj	Retargets to $(NetMinimum) and enables major-version roll-forward for the tool.
src/Microsoft.DotNet.Helix/JobMonitor/JobMonitorRunner.Design.md	Updates design documentation to reflect revised stage-attempt scoping contract.
src/Microsoft.DotNet.Helix/JobMonitor/JobMonitorRunner.cs	Parses stage attempt once and updates attempt scoping + lineage usage throughout polling/reconciliation.
src/Microsoft.DotNet.Helix/JobMonitor/JobMonitorOptions.cs	Updates StageAttempt option documentation to match the new contract expectations.
src/Microsoft.DotNet.Helix/JobMonitor/JobLineage.cs	Adds the new lineage model and stage-attempt parsing utilities.
src/Microsoft.DotNet.Helix/AzureDevOpsTestPublisher/Microsoft.DotNet.Helix.AzureDevOpsTestPublisher.csproj	Retargets to $(NetMinimum) and adds an explicit logging abstractions dependency.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.