Improve `TestEnv` for cleaner tests #8395

Job	Run time
Ruby analysis (macos-latest, default)	55s
Ruby analysis (macos-latest, linked)	55s
Ruby analysis (ubuntu-latest, linked)	44s
Ruby analysis (ubuntu-latest, nightly-latest)	51s
Ruby analysis (ubuntu-latest, default)	40s
Ruby analysis (macos-latest, nightly-latest)	44s
	4m 49s

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