Add support for adding `setup-dotnet` steps to `sync.sh` #2005

Job	Run time
Upload debug artifacts (stable-v2.20.3)	5m 45s
Upload debug artifacts (linked)	6m 17s
Upload debug artifacts (default)	7m 28s
Upload debug artifacts (nightly-latest)	6m 3s
Download and check debug artifacts	7s
	25m 40s

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