Add support for adding `setup-dotnet` steps to `sync.sh` #6316

Job	Run time
Ruby analysis (ubuntu-latest, linked)	45s
Ruby analysis (macos-latest, nightly-latest)	1m 13s
Ruby analysis (ubuntu-latest, default)	44s
Ruby analysis (macos-latest, linked)	1m 16s
Ruby analysis (macos-latest, default)	1m 12s
Ruby analysis (ubuntu-latest, nightly-latest)	50s
	6m 0s

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