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fix(versions): convert version removal celery task to migration DEV-1227 (#6442)

### 💭 Notes
Backport of https://github.com/kobotoolbox/kpi/pull/6434
Converts the remove_all_versions celery task (which accidentally had a
time limit of 30 seconds) to a long-running migration to be in keeping
with the rest of the long-running works.


### 👀 Preview steps

1. Run migrations
2. If empty, populate the Version table with
```
for i in range(100): 
     Revision.objects.create(date_created=timezone.now())
     Version.objects.create(revision_id=i, content_type_id=21)
```
3. Update `VERSION_DELETION_BATCH_SIZE` to 5
4. Restart the kpi_worker
5. Wait for the long-running migrations job to run
6. 🟢 The number of objects in the version table is decreased
7. 🟢 There are logs in the kpi_worker showing how many versions are
deleted with each run

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