kobotoolbox / kpi / 23202441547

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feat(auditLog): migrate `AuditLog`'s `object_id` to `CharField` DEV-1607 (#6821)

### 📣 Summary
This PR converts `AuditLog.object_id` from `BigInteger` to
`CharField(255)` to support string-based UIDs.


### 📖 Description
- Updated `AuditLog.object_id` to `CharField` in `models.py`
- Implemented a custom migration that alters the column type directly.
- Added logic to handle the `SKIP_HEAVY_MIGRATIONS` flag: 
- If `True`, the migration prints the SQL required for a background
index build.
    - If `False`, the migration builds the index normally.
- Verified on production that no existing indexes on `object_id` require
dropping.

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