Uniformize errors

[cicdw]

Summary

This PR captures all errors from GraphQL -> Hasura that have "connect" in the exception and converts them into a uniform "database query error". Other clients handle these errors specially, so we can rely on client-side behavior here instead of rolling custom retries in this code path. In looking at this it does seem we have some tech debt in error handling around here that we might want to revisit - low priority though.

cc: @mashun4ek

Importance

Helps with some fault tolerance in rare cases by relying on other clients' handling of "database query error"s.

Checklist

This PR:

• adds new tests (if appropriate)
• adds a change file in the changes/ directory (if appropriate)