fix(server): Favortites, attachments, timeline... (#16509)

fix(server): system objects like Favortites, attachments, timeline...
should be system fields

packages/twenty-server/src/engine/metadata-modules/flat-field-metadata/utils/generate-morph-or-relation-flat-field-metadata-pair.util.ts

@@ -130,6 +130,7 @@ export const generateMorphOrRelationFlatFieldMetadataPair = ({
     objectMetadataId: targetFlatObjectMetadata.id,
     type: FieldMetadataType.RELATION,
     workspaceId,
+    isSystem: createFieldInput.isSystem ?? false,
   };
   const targetFlatFieldMetadataSettings =
     computeFieldMetadataRelationSettingsForRelationType({

packages/twenty-server/src/engine/metadata-modules/flat-field-metadata/utils/get-default-flat-field-metadata-from-create-field-input.util.ts

@@ -38,7 +38,7 @@ export const getDefaultFlatFieldMetadata = ({
       createFieldInput.isNullable,
       createFieldInput.isRemoteCreation,
     ),
-    isSystem: false,
+    isSystem: createFieldInput.isSystem ?? false,
     isUnique: createFieldInput.isUnique ?? false,
     label: createFieldInput.label,
     name: createFieldInput.name,