Add support for adding `setup-dotnet` steps to `sync.sh` #2004

Job	Run time
Upload debug artifacts (linked)	6m 44s
Upload debug artifacts (stable-v2.20.3)	5m 14s
Upload debug artifacts (default)	3m 33s
Upload debug artifacts (nightly-latest)	7m 1s
Download and check debug artifacts	0s
	22m 32s

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