Use opaque CLI auth tokens (#627) #6518

Job	Run time
build-and-check	2m 47s
test-integration-packages/internal	1m 0s
test-integration-packages/billing	1m 10s
test-integration-common	38s
test-integration-sdk	1m 23s
test-integration-web	50s
test-integration-cli	47s
test-integration-packages/agent-runtime	37s
test-cli	54s
test-packages/internal	1m 5s
test-packages/agent-runtime	42s
test-.agents	41s
test-packages/billing	45s
test-web	1m 29s
test-sdk	45s
test-common	41s
	16m 14s

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