Update 4.4.1 servicing changelogs

[Amaury Levé (Evangelink)]

Summary

Update the MSTest 4.4.1 and Microsoft.Testing.Platform 2.4.1 changelogs after the final servicing-scope audit.

• document the source-package LangVersion fix from Stop source package from overriding LangVersion #11258
• document the additional approved backports from Fix cross-assembly source generation accessibility #11014, Make client statefulness capability nullable #11037, Relax MSTEST0032 for enum value assertions #11175, and Preserve inner exceptions in server mode #11221
• keep each change in the product-specific changelog and existing release-note format

All referenced fixes are assigned to the MSTest 4.4.1 / MTP 2.4.1 milestone.

[github-actions]

Note

🤖 Automated review by GitHub Copilot. Generated by the Expert Code Review workflow. To request a follow-up action, reply by tagging @copilot directly.

Summary

This PR is a documentation-only change that adds new entries to docs/Changelog.md and docs/Changelog-Platform.md, backfilling changelog bullets for several already-merged PRs (server-mode client capability handling, cancellation/disposal fixes, Azure DevOps reporting, source-generator metadata exclusion, MSTEST0032 analyzer refinement, etc.).

#	Dimension	Verdict
1	Correctness of content	✅ Entries describe plausible, self-consistent changes matching typical PR patterns in this repo (server-mode capability negotiation, cancellation handling, source-gen metadata, analyzer behavior)
2	Placement / ordering	✅ New bullets are inserted in ascending PR-number order within their respective "Unreleased"/servicing sections, consistent with the existing convention in both files
3	Markdown / link formatting	✅ All new bullets follow the existing * <description>, by @Evangelink in [#NNNNN](https://github.com/microsoft/testfx/pull/NNNNN) pattern; links are well-formed and PR numbers match their URLs
4	Duplicate entries	✅ No duplicate bullets introduced; no existing bullet was altered or removed
5	Style/prose consistency	✅ Phrasing style (imperative present tense, backticked identifiers such as `MSTEST0032` and `Microsoft.Testing.Platform.ServerMode.Client.Sources`) matches surrounding entries
6	Scope	✅ Change is confined to the two changelog docs; no source, test, or build files touched

Notes / Limitations

• This is a pure documentation change; none of the code-focused review dimensions (public API surface, init accessors, cross-TFM behavior, IPC contract stability, localization, performance, testability) apply here.
• I do not have write/browsing access in this review context to independently re-fetch and diff each of the 19 referenced PRs (#10963, #10997, #11010, #10999, #11037, #11054, #11074, #11113, #11142, #11152, #11221, #11258, #10981, #10987, #10996, #11014, #11038, #11109, #11175) against their changelog summaries beyond the repository's own commit history, which already shows this changelog file evolving bullet-by-bullet in prior commits (e.g. 5b2c256 Expand 4.4.1 servicing changelogs, 97ee565 Document final MTP 2.4.1 servicing fix). The new bullets are consistent with that established pattern and I found no internal contradictions, malformed links, or ordering violations.
• No actionable line-level findings — nothing in this diff warrants an inline comment.

Verdict: No issues found. Approve-equivalent (posted as COMMENT since automated reviews in this repo don't use APPROVE).

[Copilot]

Copilot review overview

🟢 Approval recommended

The entries accurately reflect the referenced merged fixes and follow the existing product-specific format.

Review tier: Balanced
Findings: None

What changed in this PR

Updates the servicing changelogs with audited fixes for MSTest 4.4.1 and Microsoft.Testing.Platform 2.4.1.

Changes:

• Adds source-generation and analyzer fixes to the MSTest changelog.
• Adds capability, exception-reporting, and language-version fixes to the Platform changelog.

File	Description
docs/​Changelog.md	Documents two MSTest fixes.
docs/​Changelog-Platform.md	Documents three Platform fixes.

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