Improve global proxy tests #8534

Job	Run time
Ruby analysis (macos-latest, default)	1m 8s
Ruby analysis (ubuntu-latest, nightly-latest)	36s
Ruby analysis (macos-latest, nightly-latest)	1m 21s
Ruby analysis (macos-latest, linked)	1m 22s
Ruby analysis (ubuntu-latest, default)	45s
Ruby analysis (ubuntu-latest, linked)	46s
	5m 58s

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