chore: restrict external HTTP calls in tests

[khvn26]

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• [x] I have run pre-commit to check linting
• [ ] I have added information to docs/ if required so people know about the feature!
• [x] I have filled in the "Changes" section below?
• [x] I have filled in the "How did you test this code" section below?
• [x] I have used a Conventional Commit title for this Pull Request

Changes

This PR adds a global restriction of HTTP requests in unit tests. When an external HTTP call is detected, the test trying to perform it fails with a notice/instruction to developers.

This PR will also add fixes to the current offending tests.

How did you test this code?

Ran the test suite.

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.90909% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 95.87%. Comparing base (53e728a) to head (9001537).

Files	Patch %	Lines
api/conftest.py	90.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3866      +/-   ##
==========================================
- Coverage   95.87%   95.87%   -0.01%     
==========================================
  Files        1133     1133              
  Lines       35873    35883      +10     
==========================================
+ Hits        34393    34402       +9     
- Misses       1480     1481       +1     

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[khvn26]

@matthewelwell This is now ready for review.