fireworks: fallback to standard api on any 500 errro #6042

Job	Run time
build-and-check	3m 13s
test-integration-packages/internal	1m 14s
test-integration-cli	52s
test-integration-packages/agent-runtime	52s
test-integration-web	39s
test-integration-common	42s
test-integration-packages/billing	1m 10s
test-packages/billing	42s
test-packages/internal	51s
test-common	43s
test-integration-sdk	1m 37s
test-packages/agent-runtime	48s
test-cli	1m 0s
test-web	52s
test-sdk	51s
test-.agents	42s
	16m 48s

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