Add scenario testing framework, initial test

[mathemancer]

Related to #4017

This adds tests for the code in #4021, and sets up a framework for scenario testing.

Run the tests with the new run_api_tests.sh script in a root window, one that has docker permissions, or using sudo.

Technical details

I'm going to leave this as a draft so @Anish9901 and I can discuss. If we decide to proceed, we should add this into the CI testing matrix pipeline.

Screenshots

Checklist

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• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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[Anish9901]

@mathemancer I've added these tests to the CI, however there are some tests that are failing and also I see some stale print statement in tests. Can you please fix the tests and remove those print statements?

[Anish9901]

Update: @mathemancer The tests seem to be failing because of our new Users APIs, I'll fix the tests.

[mathemancer]

Update: @mathemancer The tests seem to be failing because of our new Users APIs, I'll fix the tests.

Ah, I forgot about that! Well, the tests are catching what they should, at least.