switch fireworks test to use api by default #5957

Job	Run time
build-and-check	3m 7s
test-integration-packages/billing	1m 12s
test-integration-cli	41s
test-integration-common	38s
test-packages/internal	54s
test-integration-packages/internal	1m 12s
test-integration-web	48s
test-integration-sdk	1m 19s
test-integration-packages/agent-runtime	41s
test-cli	54s
test-.agents	42s
test-common	36s
test-packages/billing	42s
test-web	1m 20s
test-packages/agent-runtime	43s
test-sdk	44s
	16m 13s

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