Failed test returns OK status

[smtmfft]

Describe the bug

The test failed with error message like

2024-09-17T08:15:38.033183Z ERROR risc0_driver::bonsai::auto_scaling: Request failed with status: 502 Bad Gateway
[2024-09-17T08:15:38Z ERROR risc0_driver::bonsai] Failed to scale up bonsai: Failed to get bonsai gpu num
2024-09-17T08:15:38.613246Z ERROR risc0_driver::bonsai::auto_scaling: Last bonsai setting is not active, please check.
2024-09-17T08:16:10.716443Z ERROR raiko_host::proof: There was an error with the core: There was an error with a guest prover: ProverError::GuestError `Failed to generate proof`

But the response is

"{\"data\":{\"status\":\"unspecified_failure_reason\"},"status!":\"ok!"}

Which causes client incorrect handling.

Steps to reproduce

Steps to reproduce here.