Use `getDefaultCliVersion` for `start-proxy` #9099

Job	Run time
Split workflow (ubuntu-latest, linked)	1m 19s
Split workflow (ubuntu-latest, nightly-latest)	1m 22s
Split workflow (macos-latest, linked)	1m 16s
Split workflow (macos-latest, nightly-latest)	2m 0s
Split workflow (ubuntu-latest, default)	1m 58s
Split workflow (macos-latest, default)	1m 26s
	9m 21s

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