ads: Fix min credits to 2 #5440

Job	Run time
build-and-check	2m 32s
test-common	41s
test-cli	1m 9s
test-packages/agent-runtime	53s
test-packages/internal	46s
test-packages/billing	37s
test-sdk	42s
test-web	52s
test-.agents	39s
test-integration-common	46s
test-integration-web	37s
test-integration-packages/agent-runtime	45s
test-integration-.agents	35s
test-integration-cli	44s
test-integration-sdk	35s
test-integration-packages/billing	38s
test-integration-packages/internal	33s
	14m 4s

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