Fix legacy CLI auth code parsing #6513

Job	Run time
build-and-check	3m 9s
test-integration-packages/billing	1m 5s
test-integration-common	51s
test-integration-web	49s
test-integration-sdk	1m 18s
test-.agents	43s
test-packages/internal	50s
test-packages/billing	46s
test-integration-cli	40s
test-web	3m 13s
test-integration-packages/agent-runtime	39s
test-cli	53s
test-integration-packages/internal	1m 3s
test-packages/agent-runtime	50s
test-common	48s
test-sdk	53s
	18m 30s

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