Fix legacy CLI auth code parsing (#626) #6516

Job	Run time
build-and-check	3m 2s
test-integration-packages/internal	1m 4s
test-integration-packages/billing	1m 10s
test-integration-packages/agent-runtime	49s
test-integration-common	40s
test-integration-web	51s
test-integration-cli	51s
test-integration-sdk	1m 15s
test-common	48s
test-cli	55s
test-packages/agent-runtime	47s
test-packages/billing	40s
test-sdk	54s
test-web	1m 31s
test-.agents	39s
test-packages/internal	47s
	16m 43s

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