label not persist in data structure edit mode

[tomwwinter]

Describe the bug
Manipulated entities in structure edit view does not persist correctly. The position is saved correctly, but the edited label field resets.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://cc.aam-digital.net/child/1
2. Click on edit data structure
3. Move name field to another group and change the label
4. Click save.
5. See error: name field moved to new group, but not updated the label

Expected behavior
Label should also be saved correctly

Additional context
Not happening on the PR deployment so it seems to have to do with having a real DB.

[sleidig]

It turns out that this is an incompatibility of the new config format. Most instances are using the old array-based entity.attributes. To correctly save and persist changes, the new object-based config for entities is required.

I suggest we run a server-side migration now. The latest app version can handle both config formats, so this should not be noticeable to users. #2066

[sleidig]

Config formats have been migrated and updated in CouchDBs now, using ndb-admin API. This bug is thereby fixed.