isLabelSyncedWithName should be nullable for fieldMetadata, as it is for
objectMetadata.
+ Adding missing validation on label and name sync in
fieldMetadataService for creation and update
+ adding metadata tests
In this PR
1. Add integration tests for /metadata (master issue:
https://github.com/twentyhq/twenty/issues/8719)
2. Fix relation deletion: index on "from" object was not deleted,
impeding creation of a new relation between the same two objects A and B
after relation between A and B was deleted
