Allow zero-credit API calls without balance #6703

Job	Run time
build-and-check	2m 46s
test-integration-packages/billing	1m 3s
test-integration-web	41s
test-integration-common	39s
test-integration-sdk	1m 20s
test-packages/internal	52s
test-common	45s
test-cli	58s
test-integration-packages/internal	1m 6s
test-packages/billing	39s
test-integration-packages/agent-runtime	43s
test-integration-cli	52s
test-packages/agent-runtime	57s
test-sdk	49s
test-web	50s
test-.agents	48s
	15m 48s

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