feat: Controllable ROOT_URLCONF

[khvn26]

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Changes

This PRs refactors the root urlconf to allow the urls marker usage in tests. This is required to enable API routes when TASK_PROCESSOR_MODE is on, which enables the run_tasks fixture usage in functional tests:

@pytest.mark.urls('app.urls.api')
def test_my_stuff(
    api_client: APIClient,
    run_tasks: RunTasksFixture,
) -> None:
    # When
    api_client.get("/api/v1/my-stuff")  # path only available in API (not task processor) runtime

    # Then
    task_runs = run_tasks(1)
    assert task_runs[0].result == "SUCCESS"

How did you test this code?

Not yet.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.69%. Comparing base (ad1f3c1) to head (562457f).
⚠️ Report is 113 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5545      +/-   ##
==========================================
- Coverage   97.69%   97.69%   -0.01%     
==========================================
  Files        1247     1248       +1     
  Lines       44250    44248       -2     
==========================================
- Hits        43231    43229       -2     
  Misses       1019     1019              

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[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-5545	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-5545	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-5545	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-5545	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-5545	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5545	Finished ✅	Results ✅

[gagantrivedi]

In tests, URLs are loaded before the run_task fixture mock is applied, so we don't need ROOT_URLCONF for now