[permissions] Handle fieldPermissions configuration for 1N relations (#13630)

When upserting a fieldPermission on a 1 <-> N relation field, we should
upsert the same fieldPermission on the relationTargetFieldMetadata to
avoid inconsistencies.

packages/twenty-server/src/engine/api/__mocks__/object-metadata-item.mock.ts

@@ -141,10 +141,12 @@ export const fieldRelationMock = getMockFieldMetadataEntity({
     nameSingular: 'relationTargetObject',
     namePlural: 'relationTargetObjects',
   } as ObjectMetadataEntity,
+  relationTargetObjectMetadataId: 'relationTargetObjectId',
   relationTargetFieldMetadata: {
     id: 'relationTargetFieldId',
     name: 'relationTargetField',
   } as FieldMetadataEntity,
+  relationTargetFieldMetadataId: 'relationTargetFieldId',
   isLabelSyncedWithName: true,
   createdAt: new Date(),
   updatedAt: new Date(),