Fix legacy CLI auth code parsing #6515

Job	Run time
build-and-check	3m 7s
test-integration-packages/internal	1m 3s
test-integration-packages/billing	1m 6s
test-integration-packages/agent-runtime	44s
test-integration-cli	40s
test-integration-sdk	1m 22s
test-common	46s
test-integration-common	39s
test-packages/billing	43s
test-integration-web	51s
test-.agents	45s
test-packages/internal	52s
test-sdk	50s
test-packages/agent-runtime	53s
test-web	1m 20s
test-cli	1m 1s
	16m 42s

Provide feedback