morph dataloader specific (#13259)

In the metadata GraphQL api, we need the resolveField for the
morphRelations. This PR implements this topic.


Fixes https://github.com/twentyhq/core-team-issues/issues/1234

---------

Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-server/src/engine/metadata-modules/field-metadata/field-metadata.module.ts

@@ -112,6 +112,7 @@ import { FieldMetadataService } from './services/field-metadata.service';
   exports: [
     FieldMetadataService,
     FieldMetadataRelationService,
+    FieldMetadataMorphRelationService,
     FieldMetadataRelatedRecordsService,
     FieldMetadataEnumValidationService,
     FieldMetadataValidationService,