Add more endpoint tests

[ypc-faros]

Description

Moves Hasura endpoint tests into a separate file.
Add tests for some endpoints. More to follow.

Checklist

(Delete what does not apply)

• Have you checked to there aren't other open Pull Requests for the same update/change?
• Have you lint your code locally before submission?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you successfully run tests with your changes locally?

[thomas-gerber]

LGTM
you picked the endpoints that are hit by the Faros Event CLI, correct?

[ypc-faros]

LGTM you picked the endpoints that are hit by the Faros Event CLI, correct?

Yes (for the ones that I've done so far). But there's no reason why not to test others.