Run some unit tests in parallel #7168

Job	Run time
Ruby analysis (macos-latest, nightly-latest)	55s
Ruby analysis (macos-latest, linked)	51s
Ruby analysis (ubuntu-latest, default)	45s
Ruby analysis (macos-latest, default)	1m 3s
Ruby analysis (ubuntu-latest, linked)	43s
Ruby analysis (ubuntu-latest, nightly-latest)	56s
	5m 13s

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