Merge pull request #3542 from github/henrymercer/parallel-unit-tests #9239

Job	Run time
Split workflow (ubuntu-latest, nightly-latest)	2m 19s
Split workflow (macos-latest, nightly-latest)	1m 17s
Split workflow (macos-latest, linked)	1m 43s
Split workflow (ubuntu-latest, default)	1m 31s
Split workflow (macos-latest, default)	1m 47s
Split workflow (ubuntu-latest, linked)	1m 17s
	9m 54s

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