Add Comments Module API Tests

[d-rita]

This PR handles the Comments module-related API endpoint tests.

How to test:

• create a test database following the instructions here. The database name is preceded by test_
• pull and checkout test branch using git fetch origin && git checkout chore/add-comments-tests
• run tests using python3 -m unittest discover tests/backend

[tsmock]

Can you add an __init__.py file to the new test directory?

Almost every test directory has one (the only ones that don't were added in the past year).

You might be wondering why. nose (which is what the TM CI uses to run tests) hasn't been updated since 2016, and completely fails to run on recent python versions. I'm currently working on updating pretty much all of the dependencies for the TM (see #5642), and I'm using pytest instead of nose. I would anticipate nose2 having the same problem. And nose2 recommends pytest over itself as well.

[sonarcloud]

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