Default to `StartProxyRemoveUnusedRegistries` behaviour #12578

Job	Run time
analyze-other (actions)	47s
check-codeql-versions	11s
analyze-other (python)	54s
analyze-javascript (ubuntu-22.04)	4m 18s
analyze-javascript (ubuntu-22.04, linked)	4m 22s
analyze-javascript (ubuntu-24.04)	4m 25s
analyze-javascript (windows-2022)	6m 4s
analyze-javascript (windows-2022, linked)	5m 38s
analyze-javascript (macos-14-xlarge)	2m 22s
analyze-javascript (ubuntu-24.04, linked)	4m 25s
analyze-javascript (macos-14-xlarge, linked)	2m 42s
analyze-javascript (macos-15-xlarge)	2m 32s
analyze-javascript (windows-2025)	6m 24s
analyze-javascript (windows-2025, linked)	5m 52s
analyze-javascript (macos-15-xlarge, linked)	3m 13s
	54m 9s

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