fix: remove db dependency from unit tests

[ludtkemorgan]

There are several backend unit tests that happen to be working because we have a database running while the tests are running. If this were to not be the case these tests would start failing and there is even a failing test semi-related to this issue.

This PR mocks out all db calls that are needed in tests that are not already mocked out.

To test:

• These are already passing in circleci, but to test it locally to make sure all are caught you can change your .env file to point to a non-existent DB. I did this by changing the port on the DB url

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