FieldMetadataServiceV2.deleteOneField (#13744)

# Introduction
- Migrated the `deleteOneField` handler to new workspace migration v2
style
- Refactored the build to expect `flatObjectMetadataMaps` that he
instantly translate at the be beginning
Commented `ObjectMetadataServiceV2` as it's still not implemented
neither used

packages/twenty-server/src/engine/metadata-modules/flat-object-metadata/utils/from-flat-object-metadata-to-flat-object-metadata-with-flat-field-maps.util.ts

@@ -8,7 +8,6 @@ export const fromFlatObjectMetadataToFlatObjectMetadataWithFlatFieldMaps = (
   const emptyFlatObjectMetadataWithFlatFieldMaps: FlatObjectMetadataWithFlatFieldMaps =
     {
       ...flatObjectMetadata,
-      flatIndexMetadatas: [],
       flatFieldMetadatas: [],
       fieldIdByJoinColumnName: {},
       fieldIdByName: {},

packages/twenty-server/src/engine/metadata-modules/flat-object-metadata/utils/from-flat-object-metadatas-to-flat-object-metadata-maps.util.ts

@@ -1,21 +1,16 @@
-import { type FlatObjectMetadataMaps } from 'src/engine/metadata-modules/flat-object-metadata-maps/types/flat-object-metadata-maps.type';
+import { EMPTY_FLAT_OBJECT_METADATA_MAPS } from 'src/engine/metadata-modules/flat-object-metadata-maps/constant/empty-flat-object-metadata-maps.constant';
 import { addFlatObjectMetadataToFlatObjectMetadataMapsOrThrow } from 'src/engine/metadata-modules/flat-object-metadata-maps/utils/add-flat-object-metadata-to-flat-object-metadata-maps-or-throw.util';
 import { type FlatObjectMetadata } from 'src/engine/metadata-modules/flat-object-metadata/types/flat-object-metadata.type';
 
 export const fromFlatObjectMetadatasToFlatObjectMetadataMaps = (
   flatObjectMetadatas: FlatObjectMetadata[],
 ) => {
-  const emptyFlatObjectMetadataMaps: FlatObjectMetadataMaps = {
-    byId: {},
-    idByNameSingular: {},
-  };
-
   return flatObjectMetadatas.reduce(
     (flatObjectMetadataMaps, flatObjectMetadata) =>
       addFlatObjectMetadataToFlatObjectMetadataMapsOrThrow({
         flatObjectMetadata,
         flatObjectMetadataMaps,
       }),
-    emptyFlatObjectMetadataMaps,
+    EMPTY_FLAT_OBJECT_METADATA_MAPS,
   );
 };