Drop JSONField workarounds from tests

[amureki]

Describe the change
As JSONField is supported since Django 3.1 :)

PR Checklist

• Change is covered with tests
• CHANGELOG.md is updated if needed

Summary by CodeRabbit

• Tests

  • Streamlined test setup by removing conditional test skipping; field-related tests now execute consistently.

• Chores

  • Removed compatibility workarounds from test infrastructure, improving code maintainability.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The PR removes conditional import handling and test skip logic for JSONField in the test suite, simplifying the codebase by assuming JSONField availability as a standard Django feature.

Changes

Cohort / File(s)	Summary
Changelog update CHANGELOG.md	Added unreleased entry documenting removal of JSONField test workarounds.
JSONField import simplification tests/test_filling_fields.py	Removed try/except ImportError block and PostgresJSONField alias; added direct JSONField import from django.db.models; removed @pytest.mark.skipif decorator that conditionally skipped tests.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐰 No more workarounds, no skipped test lines,
JSONField's here to stay, everything aligns!
Clean imports, simpler code—a rabbit's delight,
Django's dependencies managed just right! ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The pull request title directly and clearly describes the main change: removing JSONField workarounds from tests, which is exactly what the changeset accomplishes.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing touches

• 📝 Generate docstrings

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