Consider Custom Exception Handling

[glass-ships]

Currently if a request doesn't return 200, you'll just get some unhelpful generic message like Internal Server Error.
And our current way to actually get that info is to

• gcloud ssh to monarch-v3-prod-manager
• maybe sudo su if you're not a docker user for some reason
• docker service logs -f -n 100 monarch-v3_api

We can optionally add debug=True to the FastApi app definition in backend, but the output is pretty excessive.

It may be worth deciding what kind of info / how we want it presented on errored links