Fix legacy CLI auth code parsing #6514

Job	Run time
build-and-check	2m 54s
test-integration-packages/billing	1m 6s
test-integration-packages/internal	1m 15s
test-integration-cli	45s
test-integration-packages/agent-runtime	49s
test-integration-sdk	1m 15s
test-integration-web	49s
test-integration-common	51s
test-packages/billing	46s
test-web	3m 6s
test-common	47s
test-cli	59s
test-packages/agent-runtime	42s
test-packages/internal	57s
test-.agents	42s
test-sdk	59s
	18m 42s

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