Revert: No changes needed for flaky DiagnosticTests#997

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Copilot wants to merge 6 commits intomainfrom

copilot/fix-flaky-tests-ci

Commits on Nov 20, 2025

Initial plan
Copilot
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Fix flaky DiagnosticTests by clearing Activity.Current and forcing flush

Copilot
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stephentoub
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Use ExclusiveExecution collection fixture to ensure DiagnosticTests don't run concurrently with any other tests

Copilot
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stephentoub
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Revert to original DisableParallelization collection, remove Activity.Current and ForceFlush changes

Copilot
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stephentoub
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Add ExclusiveExecution collection to prevent DiagnosticTests from running in parallel with tests that create activities

Copilot
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stephentoub
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Revert all changes - existing DisableParallelization collection is sufficient per xUnit documentation

Copilot
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stephentoub
committed