chore: add ast-grep rule to convert Optional[T] to T | None (#25560)

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

api/services/metadata_service.py

@@ -1,6 +1,5 @@
 import copy
 import logging
-from typing import Optional
 
 from flask_login import current_user
 
@@ -237,7 +236,7 @@ class MetadataService:
                 redis_client.delete(lock_key)
 
     @staticmethod
-    def knowledge_base_metadata_lock_check(dataset_id: Optional[str], document_id: Optional[str]):
+    def knowledge_base_metadata_lock_check(dataset_id: str | None, document_id: str | None):
         if dataset_id:
             lock_key = f"dataset_metadata_lock_{dataset_id}"
             if redis_client.get(lock_key):