Only use fireworks provider for free mode #5864

Job	Run time
build-and-check	2m 58s
test-integration-packages/internal	1m 7s
test-integration-packages/billing	1m 10s
test-integration-web	40s
test-integration-packages/agent-runtime	43s
test-integration-sdk	1m 19s
test-integration-cli	42s
test-integration-common	44s
test-.agents	42s
test-cli	56s
test-packages/internal	50s
test-web	50s
test-packages/agent-runtime	46s
test-packages/billing	45s
test-sdk	42s
test-common	43s
	15m 37s

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