kobotoolbox / kpi / 23500811961

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fix(longRunningMigrations): retry on transient DB errors, fix 0011 extra_details DEV-1910 (#6858)

### 👷 Description for instance maintainers

Several long-running migrations were silently failing due to transient
database connection errors, causing them to be permanently stuck in a
`FAILED` state and never retried.

The migration runner now detects known transient errors (autocommit
conflicts, in-progress connection errors) and retries on the next
scheduled run instead of marking the migration as failed. A Django
migration (`0021`) resets any previously failed migrations back to
`created` so they resume automatically on deploy.

Two fixes were also applied to `0011_backfill_exceeded_limit_counters`:
it now creates the user profile if missing, and updates the completion
flag directly in the database to avoid triggering organization name sync
logic that could fail on names longer than 200 characters.

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