feat: add missing updateMany and deleteMany resolvers on flexible backend (#2758)

* feat: add missing updateMany and deleteMany resolvers on flexible backend

Co-authored-by: v1b3m <vibenjamin6@gmail.com>

* Refactor according to review

Co-authored-by: v1b3m <vibenjamin6@gmail.com>

* Update return types for `createMany`, `updateMany` and `deleteMany`

Co-authored-by: v1b3m <vibenjamin6@gmail.com>

---------

Co-authored-by: gitstart-twenty <gitstart-twenty@users.noreply.github.com>
Co-authored-by: v1b3m <vibenjamin6@gmail.com>

server/src/workspace/utils/get-resolver-name.util.ts

@@ -21,6 +21,10 @@ export const getResolverName = (
       return `update${pascalCase(objectMetadata.nameSingular)}`;
     case 'deleteOne':
       return `delete${pascalCase(objectMetadata.nameSingular)}`;
+    case 'updateMany':
+      return `update${pascalCase(objectMetadata.namePlural)}`;
+    case 'deleteMany':
+      return `delete${pascalCase(objectMetadata.namePlural)}`;
     default:
       throw new Error(`Unknown resolver type: ${type}`);
   }