Allow zero-credit API calls without balance (#718) #6704

Job	Run time
build-and-check	2m 47s
test-integration-packages/internal	1m 7s
test-integration-sdk	1m 17s
test-integration-cli	39s
test-integration-packages/billing	59s
test-integration-web	43s
test-integration-common	44s
test-.agents	41s
test-cli	54s
test-web	50s
test-packages/billing	44s
test-sdk	49s
test-common	51s
test-integration-packages/agent-runtime	43s
test-packages/internal	57s
test-packages/agent-runtime	45s
	15m 30s

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