## Description

It's okay for the list of locally known migrations to be a subset of the
applied migrations, rather than a prefix (The only clear issue is if
there is a migration that has been embedded locally, but that hasn't
been run on the DB).

## Test plan

New unit test:

```
sui-indexer$ cargo nextest run
```

And confirm against the production DB.

---

## Release notes

Check each box that your changes affect. If none of the boxes relate to
your changes, release notes aren't required.

For each box you select, include information after the relevant heading
that describes the impact of your changes that a user might notice and
any actions they must take to implement updates.

- [ ] Protocol:
- [ ] Nodes (Validators and Full nodes):
- [ ] Indexer:
- [ ] JSON-RPC:
- [ ] GraphQL:
- [ ] CLI:
- [ ] Rust SDK:
- [ ] REST API: