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Remove `ToTheoryData` for xUnit v3 #1931

Job	Run time
Generate NuGet Packages	1m 21s
Build and Test (ubuntu-latest, 5.0.0)	2m 15s
Build and Test (ubuntu-latest, 6.0.1)	2m 35s
Build and Test (windows-latest, 5.0.0)	5m 51s
Trimming and AOT Test	1m 10s
Build and Test (windows-latest, 6.0.1)	5m 51s
	19m 3s

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