test(search/alerts/feeds): replace fixtures with factories

[johnjhughes]

Replace search/alerts fixtures with factories

Summary

This PR migrates a small set of tests away from Django JSON fixtures and onto factories, as part of the broader fixture cleanup tracked in #2148.

Details

• Replace fixture usage with factories in:
  • cl/search/tests/tests.py
  • cl/alerts/tests/tests.py
  • cl/tests/test_feeds.py
  • cl/tests/test_issue412.py
• Keep existing fixture files in place (they are still referenced by other modules outside this PR’s scope).

Related to: #2148

Tests

• uv run python manage.py test --parallel 1 cl.search.tests.tests.ModelTest cl.search.tests.tests.OpinionSearchFunctionalTest cl.alerts.tests.tests.DisableDocketAlertTest cl.alerts.tests.tests.AlertSeleniumTest cl.tests.test_feeds cl.tests.test_issue412

Notes

• No tests removed: def test_ counts are unchanged in each migrated module.

[Copilot]

Pull request overview

This PR continues the ongoing migration away from Django JSON fixtures by updating several test modules (including Selenium functional tests) to build test data using factories, improving clarity and reducing reliance on shared fixture state.

Changes:

• Replaced fixtures = [...] usage with explicit factory-built test data setup in multiple test modules.
• Improved Selenium test robustness with additional explicit waits and small flake-mitigation fallbacks.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
cl/tests/test_issue412.py	Replaces opinion/docket/audio blocking fixtures with factory-created courts, clusters, opinions, and audio used by Selenium tests.
cl/tests/test_feeds.py	Replaces feed functional test fixtures with factory-created opinions and audio content needed for feed assertions.
cl/search/tests/tests.py	Replaces search test fixtures with factories and adds Selenium timing improvements (waits, element targeting, modal/dropdown fallbacks).
cl/alerts/tests/tests.py	Replaces court fixture usage in alert tests with factory-created courts; adjusts Selenium test setup ordering.

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