[main] Source code updates from microsoft/vstest

[dotnet-maestro]

Note

This is a codeflow update. It may contain both source code changes from
the source repo
as well as dependency updates. Learn more here.

This pull request brings the following source code changes

From https://github.com/microsoft/vstest

• Subscription: 18bbdb94-a246-4c59-987c-d1d2f1516254
• Build: 20260715.3 (323060)
• Date Produced: July 15, 2026 10:24:33 PM UTC
• Commit: 821d5b602761c06ee420cb0e826f7a5ea9db495d
• Commit Diff: 4294cde...821d5b6
• Branch: main

Diff the source with this PR branch

darc vmr diff --name-only https://github.com/microsoft/vstest:821d5b602761c06ee420cb0e826f7a5ea9db495d..https://github.com/dotnet/dotnet:darc-main-4c1a1669-8c5d-4443-96ee-f3b7c37af99f

[dotnet-maestro]

Note

PRs from original repository included in this codeflow update:

• Surface per-test standard output/error on the MTP execution path microsoft/vstest#16284
• Surface out-of-process data collector messages on the MTP execution path microsoft/vstest#16272
• Enrich filter escaping, runsettings link, coverage, and CLI reference docs microsoft/vstest#16277
• Modernize stale docs (TFMs, code coverage, env vars, MTP context) microsoft/vstest#16279

💡 You may consult the FAQ for more information or tag @dotnet/prodconsvcs for assistance.

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