Reorganize MTP features by functionality and document GitHub Actions report

[Evangelink]

Summary

Restructures the Microsoft.Testing.Platform features article so extensions are grouped by functionality rather than by lifecycle/experimental status, and documents the new GitHub Actions report extension.

Changes to docs/core/testing/microsoft-testing-platform-features.md

• Removed the ## Experimental extensions category. Its items (Video recorder, Packaged app deployment) now live under ## Extension features, each keeping an inline (experimental) marker. Experimental status is a per-extension flag, not a grouping.
• Removed the standalone ## Logging integration category. Replaced with a functional ## Microsoft.Extensions integration section (short name) that holds the logging bridge.
• Marked the logging bridge as experimental. Confirmed [Experimental("TPEXP")] on AddMicrosoftExtensionsLogging in microsoft/testfx.
• Added a shared intro note explaining the TPEXP experimental diagnostic and the (experimental) convention (replaces the paragraph that previously lived only under "Experimental extensions").
• Documented Microsoft.Testing.Extensions.GitHubActionsReport (from Add Microsoft.Testing.Extensions.GitHubActionsReport (groups, annotations, step summary, slow-test notices) microsoft/testfx#9541) under Extension features, next to Test reports: per-assembly log groups, failure annotations, GITHUB_STEP_SUMMARY job summary, slow-test notices, auto-activation via GITHUB_ACTIONS, the --report-gh* toggles, and builder.AddGitHubActionsProvider(). Added a matching "Choose by scenario" bullet.

Content source

• Logging / video recorder / packaged app content: adapted from existing article text.
• GitHub Actions report section: adapted from the Add Microsoft.Testing.Extensions.GitHubActionsReport (groups, annotations, step summary, slow-test notices) microsoft/testfx#9541 PR description and PACKAGE.md.

Note

microsoft/testfx#9541 is still open. The GitHub Actions report entry (package name, options, and builder.AddGitHubActionsProvider() registration) is provisional and should be re-verified before/at merge of that PR.

No toc.yml changes were needed — these were on-page H2 categories, not separate TOC entries, and no other files referenced the removed section anchors.

ai-usage: ai-assisted

---

Internal previews

📄 File	🔗 Preview link
docs/core/testing/microsoft-testing-platform-features.md	Microsoft.Testing.Platform (MTP) features

[Copilot]

Pull request overview

This pull request reorganizes the Microsoft.Testing.Platform (MTP) features article so extension features are grouped by functionality, and it adds documentation for the GitHub Actions report extension.

Changes:

• Adds a shared note describing the TPEXP experimental diagnostic and the (experimental) marker convention.
• Reorganizes extension content by functionality, including a new Microsoft.Extensions integration section for the logging bridge.
• Documents the GitHub Actions report extension, including activation behavior, CLI switches, and manual registration.

Show a summary per file

File	Description
docs/core/testing/microsoft-testing-platform-features.md	Reorders feature sections by functionality, adds an experimental-status note, and introduces GitHub Actions report extension documentation.

Copilot's findings

• Files reviewed: 1/1 changed files
• Comments generated: 2