Add Azure Login support and consolidate release notes

[igoravl]

• Investigate the .github/workflows/main.yml release notes extraction step
• Tighten the version header regex pattern (require [version] syntax and optional - YYYY-MM-DD)
• Add explicit failure when no matching version section is found

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Pull request overview

Adds Azure Login authentication (via Azure.Identity) with token renewal support, and consolidates per-version release note files into a single Keep a Changelog–style RELEASENOTES.md.

Changes:

• Introduces -AzureLogin credential mode backed by DefaultAzureCredential and caches the credential for renewal.
• Updates connection retrieval to refresh Azure DevOps tokens by rebuilding the connection when the cached token is near expiry.
• Consolidates and validates release notes from a single RELEASENOTES.md, updating CI to extract notes from it.

Reviewed changes

Copilot reviewed 56 out of 56 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
psake.ps1	Updates release notes validation to scan consolidated RELEASENOTES.md.
RELEASENOTES.md	Replaces scattered markdown files with a unified Keep a Changelog formatted changelog.
Docs/ReleaseNotes/*.md	Deletes old per-version release note files after consolidation.
Docs/CommonHelpText.psd1	Adds help text for the new -AzureLogin parameter.
CSharp/TfsCmdlets/TfsCmdlets.csproj	Adds Azure.Identity dependency.
CSharp/TfsCmdlets/Services/Impl/DataManagerImpl.cs	Rebuilds cached connections when Azure token is expired.
CSharp/TfsCmdlets/Services/Impl/CurrentConnectionsImpl.cs	Stores AzureCredential in current connections and clears it on reset.
CSharp/TfsCmdlets/Services/ICurrentConnections.cs	Exposes AzureCredential on the current connections interface.
CSharp/TfsCmdlets/Services/AzureCredential.cs	Implements token acquisition/caching and VSS credential creation via Azure.Identity.
CSharp/TfsCmdlets/Cmdlets/Credential/NewCredential.cs	Adds Azure Login mode and stores the credential for later refresh.
CSharp/TfsCmdlets.SourceGenerators/Generators/Cmdlets/CmdletInfo.cs	Adds generated -AzureLogin parameter and parameter set name.
.github/workflows/main.yml	Updates artifacts and release notes extraction to use RELEASENOTES.md.

Comments suppressed due to low confidence (1)

psake.ps1:1

• The regex uses the unescaped $ThreePartVersion, so dots in versions (e.g. 2.10.0) are treated as regex wildcards and may match the wrong heading (or a partial match). Use [regex]::Escape($ThreePartVersion) and consider making the header match stricter (e.g., require ## [ + version + ] followed by a space / dash) to avoid false positives.

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Test Results

  2 files   80 suites   1m 35s ⏱️
139 tests 139 ✅ 0 💤 0 ❌
278 runs  278 ✅ 0 💤 0 ❌

Results for commit 1dbbac8.

♻️ This comment has been updated with latest results.