Identify migration helpers that use non-batched background migrations

Now that the old style regular background migrations have been deprecated, we need to clean up all of the migration helpers that use them under the hood and migrate them to the new batched variety.

FIRST we need to just make a list of all of them and make issues.

Deliverables

• Issues are filed to convert each helper that uses background migrations
• Update helper documentation to note that those migrations still use "old" background migrations.

Template:

Issue Title: Helper <helper name> should use batched background migrations

With, old background migrations deprecated, <helper name> needs to be updated to use batched background migrations. The last time this helper was used was <migration commit date>.

## Deliverables
- [ ] <helper name> no longer uses old style background migrations
- [ ] Documentation is updated to reflect that the helper uses batched migrations.