Add support for adding `setup-dotnet` steps to `sync.sh` #6315

Job	Run time
Ruby analysis (ubuntu-latest, linked)	45s
Ruby analysis (macos-latest, linked)	1m 9s
Ruby analysis (ubuntu-latest, default)	46s
Ruby analysis (macos-latest, nightly-latest)	49s
Ruby analysis (ubuntu-latest, nightly-latest)	50s
Ruby analysis (macos-latest, default)	1m 17s
	5m 36s

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