xUnit3 migration - Complete with IDataAttribute interface pattern (5,939+ tests passing)#18950

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Copilot wants to merge 32 commits intomainfrom

copilot/fix-70fb3ceb-020a-4b9d-8060-269d2c188324

Commits on Oct 1, 2025

Initial plan
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Update package versions and central props for xUnit3 migration

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T-Gro
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Remove UnitTestType and IsTestProject properties, update xunit.runner.json files

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T-Gro
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Update xunit.runner.json files to xUnit3 schema (backward compatible)

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T-Gro
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Add test infrastructure documentation to TESTGUIDE.md

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T-Gro
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Add nuget.org source, update to xUnit3 packages, begin API migration

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Document xUnit3 API migration requirements and create detailed guide

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T-Gro
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Investigate xUnit3 API availability - DataAttribute confirmed present

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T-Gro
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Commits on Oct 2, 2025

Commits on Oct 3, 2025

Commits on Oct 6, 2025