test: API tests with mocked server/deps

[hopeyen]

Task from #7

API tests for

• constant routes
  • health
  • version
  • operator/info
• nested passthroughs
  • graph node query endpoint
  • network subgraph (if not locally syncing the deployment)
  • allocation monitors and signers
  • cost server
  • graph node status endpoint

[cargopete]

/query
/status
There are static. The rest of the endpoints rely on parameters.