Make sure that entity lists are consistent between follow up forms

[seadowg]

Blocked by #5972

Entity lists should be the same across all follow up forms on device. Inconsistencies are unlikely to happen when using "Exactly match server", but it's fairly possible to construct a scenario where they could be inconsistent for some implementations if using manual downloads.

Acceptance

• [ ] Given I've added an entity list manually locally (in the entity browser) And there are two entity follow up forms on the server And I've downloaded the first When a new entity is added on the server And I download the second form Then the new entity is included in the first form

Notes

We probably want to add something the OpenRosa API so that the client can know that a secondary instance CSV is an entity list so that we don't need to flag it manually.