kobotoolbox / kpi / 14403671905

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feat(longRunningMigrations): add system check to validate completion of critical long-running migrations TASK-1765 (#5655)

### 📣 Summary
Added a Django system check to ensure important long-running migrations
have completed

### 📖 Description
This PR introduces a Django system check that validates whether specific
long-running migrations—considered critical to data integrity or system
functionality—have been completed. If any of these migrations are still
running or incomplete, the system check will raise an error to prevent
the application from starting.

This mechanism not only protects the system from running in an
inconsistent state, but also serves as a useful signal for sysadmins,
giving them immediate visibility into whether the database is fully
up-to-date. Instead of silently failing or relying on logs, this check
provides a clear and explicit message during startup, making it easier
to identify and act on pending background data migrations.

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