Add tests using mocked API requests

[AlanCoding]

SUMMARY

Still failing. Unclear if it's a test issue or a server issue. I think the setup should be reasonable.

FAILED awx/main/tests/functional/api/test_inventory.py::TestInventoryAllVariables::test_update_then_user_change - AssertionError: assert {'foo': 'foo_source', 'bar': 'bar_source'} == {'foo': 'foo_user'}
  
  Differing items:
  {'foo': 'foo_source'} != {'foo': 'foo_user'}
  Left contains 1 more item:
  {'bar': 'bar_source'}
  
  Full diff:
    {
  +     'bar': 'bar_source',
  -     'foo': 'foo_user',
  ?                  ^ -
  +     'foo': 'foo_source',
  ?                 ++ ^^
    }

ISSUE TYPE

• Bug, Docs Fix or other nominal change

COMPONENT NAME

• API

[sonarqubecloud]

Quality Gate failed

Failed conditions
C Reliability Rating on New Code (required ≥ A)

See analysis details on SonarQube Cloud

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[codecov]

Codecov Report

Attention: Patch coverage is 28.57143% with 20 lines in your changes missing coverage. Please review.

Project coverage is 40.73%. Comparing base (a186fa6) to head (5c2376a).

✅ All tests successful. No failed tests found.

❌ Your patch check has failed because the patch coverage (28.57%) is below the target coverage (100.00%). You can increase the patch coverage or adjust the target coverage.
❌ Your project check has failed because the head coverage (33.06%) is below the target coverage (95.00%). You can increase the head coverage or adjust the target coverage.

❗ There is a different number of reports uploaded between BASE (a186fa6) and HEAD (5c2376a). Click for more details.

HEAD has 9 uploads less than BASE

Flag	BASE (a186fa6)	HEAD (5c2376a)
CI-GHA	8	5
pytest	5	2
OS-Linux	8	5

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