Improve `TestEnv` for cleaner tests #4088

Job	Run time
Upload debug artifacts (nightly-latest)	1m 25s
Upload debug artifacts (default)	1m 11s
Upload debug artifacts (linked)	1m 23s
Upload debug artifacts (stable-v2.20.3)	1m 9s
Download and check debug artifacts	1s
	5m 9s

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