docs: add missing changelog entry for `#9641` (GitHubActionsReport skipped-test warnings)

[github-actions]

Adds the missing docs/Changelog-Platform.md entry for #9641, which was merged on 2026-07-05 but had no changelog entry.

What was missing:
PR #9641 extended Microsoft.Testing.Extensions.GitHubActionsReport to emit ::warning annotations for skipped tests — a user-visible feature addition. The entry was not in the Platform changelog.

Change:
Added to docs/Changelog-Platform.md under [2.3.0] UNRELEASED → Added:

* Emit `::warning` annotations for skipped tests in `Microsoft.Testing.Extensions.GitHubActionsReport` by `@Evangelink` in `#9641`

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Show patch (27 lines)

From 8acfcaf945fe6b35b468e6543375e582f88a017f Mon Sep 17 00:00:00 2001
From: "github-actions[bot]" <github-actions[bot]@users.noreply.github.com>
Date: Mon, 6 Jul 2026 07:11:18 +0000
Subject: [PATCH] docs: add missing changelog entry for #9641
 (GitHubActionsReport skipped-test warnings)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 docs/Changelog-Platform.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/docs/Changelog-Platform.md b/docs/Changelog-Platform.md
index 37e1730..e207d34 100644
--- a/docs/Changelog-Platform.md
+++ b/docs/Changelog-Platform.md
@@ -47,6 +47,7 @@ See full log [of v4.2.3...v4.3.0](https://github.com/microsoft/testfx/compare/v4
 * Add `--report-azdo-groups <on|off>` and `--report-azdo-annotations <on|off>` toggles to Azure DevOps report extension by @Evangelink in [#9542](https://github.com/microsoft/testfx/pull/9542)
 * Re-print errored assemblies in dotnet test end-of-run recap by @Evangelink in [#9545](https://github.com/microsoft/testfx/pull/9545)
 * Add server-initiated session cancellation to the dotnet test IPC protocol by @Evangelink in [#9549](https://github.com/microsoft/testfx/pull/9549)
+* Emit `::warning` annotations for skipped tests in `Microsoft.Testing.Extensions.GitHubActionsReport` by @Evangelink in [#9641](https://github.com/microsoft/testfx/pull/9641)
 
 ### Fixed
 
-- 
2.54.0