Remove old relations (#11993)

This is a first PR to remove old relation logic

Next steps:
- remove relationMetadata from cache
- remove relationMetadata table content and structure
- refactor relationDefinition to leverage field.settings instead

packages/twenty-server/src/engine/twenty-orm/repository/workspace.repository.ts

@@ -729,14 +729,7 @@ export class WorkspaceRepository<
     objectMetadata ??= await this.getObjectMetadataFromTarget();
 
     const objectMetadataMaps = this.internalContext.objectMetadataMaps;
-    const isNewRelationEnabled =
-      this.internalContext.featureFlagsMap[FeatureFlagKey.IsNewRelationEnabled];
 
-    return formatResult(
-      data,
-      objectMetadata,
-      objectMetadataMaps,
-      isNewRelationEnabled,
-    ) as T;
+    return formatResult(data, objectMetadata, objectMetadataMaps) as T;
   }
 }