Default to `StartProxyRemoveUnusedRegistries` behaviour #7970

Job	Run time
Ruby analysis (ubuntu-latest, default)	44s
Ruby analysis (macos-latest, nightly-latest)	1m 31s
Ruby analysis (ubuntu-latest, linked)	41s
Ruby analysis (ubuntu-latest, nightly-latest)	51s
Ruby analysis (macos-latest, default)	1m 3s
Ruby analysis (macos-latest, linked)	1m 27s
	6m 17s

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