Run some unit tests in parallel #7170

Job	Run time
Ruby analysis (macos-latest, nightly-latest)	1m 11s
Ruby analysis (ubuntu-latest, linked)	51s
Ruby analysis (macos-latest, default)	51s
Ruby analysis (ubuntu-latest, nightly-latest)	52s
Ruby analysis (macos-latest, linked)	1m 6s
Ruby analysis (ubuntu-latest, default)	48s
	5m 39s

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