Fixed #36892 -- Handled lazy objects in serializer_factory

[Ahmedshammas]

Trac ticket number

ticket-36892

Branch description

This patch ensures that django.utils.functional.lazy objects (such as lazy tuples used for field choices) are correctly unwrapped before serialization.

Previously, these objects were being serialized as strings, causing the migration autodetector to falsely identify changes and generate redundant migrations on every run. I have updated serializer_factory to use _proxy____cast() for Promise objects and added a regression test in tests/migrations/test_serializer.py.

AI Assistance Disclosure (REQUIRED)

• [x ] No AI tools were used in preparing this PR.
• If AI tools were used, I have disclosed which ones, and fully reviewed and verified their output.

Checklist

• [x ] This PR follows the contribution guidelines.
• [x ] This PR does not disclose a security vulnerability (see vulnerability reporting).
• [ x] This PR targets the main branch.
• [ x] The commit message is written in past tense, mentions the ticket number, and ends with a period.
• [ x] I have checked the "Has patch" ticket flag in the Trac system.
• [ x] I have added or updated relevant tests.
• [ x] I have added or updated relevant docs, including release notes if applicable.
• [ x] I have attached screenshots in both light and dark modes for any UI changes.

[github-actions]

📊 Coverage Report for Changed Files

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Diff Coverage
Diff: origin/main...HEAD, staged and unstaged changes
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django/db/migrations/serializer.py (100%)
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Total:   1 line
Missing: 0 lines
Coverage: 100%
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Note: Missing lines are warnings only. Some lines may not be covered by SQLite tests as they are database-specific.

For more information about code coverage on pull requests, see the contributing documentation.

[jacobtylerwalls]

Hi 👋

The PR contains unrelated changes, no tests, and doesn't follow the PR checklist for commit messages. Feel free to resubmit a PR when you have something closer to the target.