Merge pull request #3542 from github/henrymercer/parallel-unit-tests #2871

Job	Run time
Upload debug artifacts (linked)	7m 23s
Upload debug artifacts (default)	6m 2s
Upload debug artifacts (stable-v2.20.3)	6m 6s
Upload debug artifacts (nightly-latest)	6m 7s
Download and check debug artifacts	5s
	25m 43s

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