.NET Core Test and Publish

Optimizations for `KeyBuilder` #10556

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Run time

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Job	Run time
Format	1m 15s
Test-Everything	58s
Test (ubuntu-latest)	4m 2s
Test (windows-latest)	3m 26s
Test (macos-latest)	1m 35s
PublishPackage	0s
	11m 16s