Improve `TestEnv` for cleaner tests #8396

Job	Run time
Ruby analysis (ubuntu-latest, default)	41s
Ruby analysis (macos-latest, default)	1m 15s
Ruby analysis (ubuntu-latest, linked)	45s
Ruby analysis (macos-latest, linked)	1m 8s
Ruby analysis (ubuntu-latest, nightly-latest)	53s
Ruby analysis (macos-latest, nightly-latest)	58s
	5m 40s

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