Closes https://github.com/twentyhq/core-team-issues/issues/1316
As discussed with @Bonapara, the behaviour is the following:
1 if there is a read restriction on a field that is or becomes the label
identifier, this restriction is actually overriden to allow any user who
has read rights on the object to also be able to read the values on the
label identifier field. This restriction is overriden in the values
stored in the cache but not in the db.
2 in the UI it is not possible to add a field permission to restrict
read rights on the field that is the label identifier. It is still
possible to update the label identifier for it to be a field that
previously had a restrictive field permission on a role though, but then
1. has our back.
