kobotoolbox / kpi / 19940642159

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feat(trash): set removed users to null in audit logs DEV-1253  (#6525)

### 📣 Summary
Long running job that removes users ids from audit logs for removed
users

### 👀 Preview steps
1. ℹ️ have an account with multiple audit logs
2. Remove the user, empty the user trash 
3. Go to the django shell and find the logs for the removed user,
restore the user_id based on the user_uid field in the audit logs:
```
uid = User.objects.get(username='test_username').extra_details.uid
logs = AuditLog.objects.filter(user_uid=uid)
for log in logs:
    log.user_id=user_id
    log.save()
```
4. Execute the job manually (or wait for it to run), it should show an
output like so:
```
lrm = LongRunningMigration.objects.get(name__contains='0013_set_null_for_removed_users')
lrm.execute()
    Processing chunk of 4 users ...
```
5. Check again the logs for that user to confirm the user_id is now null
```
for log in logs:
    assert log.user_id is None
```

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