C#: Run QL Tests

C#: Do not run multiple `dotnet/nuget restore` in parallel #4270

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Run time

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Job	Run time
stubgentest	5m 4s
qlupgrade	55s
qltest (1/2)	19m 35s
unit-tests (ubuntu-latest)	1m 6s
qltest (2/2)	20m 4s
unit-tests (windows-2019)	2m 49s
	49m 33s