Use opaque CLI auth tokens #6517

Job	Run time
build-and-check	2m 48s
test-integration-packages/billing	1m 0s
test-integration-packages/internal	1m 3s
test-integration-cli	43s
test-integration-sdk	1m 14s
test-integration-web	41s
test-integration-common	38s
test-integration-packages/agent-runtime	45s
test-common	39s
test-packages/billing	51s
test-cli	52s
test-.agents	45s
test-packages/internal	50s
test-packages/agent-runtime	46s
test-sdk	41s
test-web	1m 28s
	15m 44s

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