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/saved_message_service.py

@@ -1,4 +1,4 @@
-from typing import Optional, Union
+from typing import Union
 
 from extensions.ext_database import db
 from libs.infinite_scroll_pagination import InfiniteScrollPagination
@@ -11,7 +11,7 @@ from services.message_service import MessageService
 class SavedMessageService:
     @classmethod
     def pagination_by_last_id(
-        cls, app_model: App, user: Optional[Union[Account, EndUser]], last_id: Optional[str], limit: int
+        cls, app_model: App, user: Union[Account, EndUser] | None, last_id: str | None, limit: int
     ) -> InfiniteScrollPagination:
         if not user:
             raise ValueError("User is required")
@@ -32,7 +32,7 @@ class SavedMessageService:
         )
 
     @classmethod
-    def save(cls, app_model: App, user: Optional[Union[Account, EndUser]], message_id: str):
+    def save(cls, app_model: App, user: Union[Account, EndUser] | None, message_id: str):
         if not user:
             return
         saved_message = (
@@ -62,7 +62,7 @@ class SavedMessageService:
         db.session.commit()
 
     @classmethod
-    def delete(cls, app_model: App, user: Optional[Union[Account, EndUser]], message_id: str):
+    def delete(cls, app_model: App, user: Union[Account, EndUser] | None, message_id: str):
         if not user:
             return
         saved_message = (