Fix flat field metadata date type (#16445)

# Introduction
Following https://github.com/twentyhq/twenty/pull/16420

packages/twenty-server/src/engine/metadata-modules/flat-field-metadata/validators/utils/validate-enum-flat-field-metadata.util.ts

@@ -197,8 +197,8 @@ const validateDuplicates = (
   return errors;
 };
 
-const validateFieldMetadataInputOptions = <T extends EnumFieldMetadataType>(
-  flatFieldMetadata: FlatFieldMetadata<T>,
+const validateFieldMetadataInputOptions = (
+  flatFieldMetadata: FlatFieldMetadata<EnumFieldMetadataType>,
 ): FlatFieldMetadataValidationError[] => {
   const { options } = flatFieldMetadata;