Add support for adding `setup-dotnet` steps to `sync.sh` #6318

Job	Run time
Ruby analysis (macos-latest, default)	1m 7s
Ruby analysis (ubuntu-latest, linked)	48s
Ruby analysis (ubuntu-latest, nightly-latest)	50s
Ruby analysis (ubuntu-latest, default)	53s
Ruby analysis (macos-latest, linked)	48s
Ruby analysis (macos-latest, nightly-latest)	1m 4s
	5m 30s

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