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/plugin/plugin_migration.py

@@ -5,7 +5,7 @@ import time
 from collections.abc import Mapping, Sequence
 from concurrent.futures import ThreadPoolExecutor
 from pathlib import Path
-from typing import Any, Optional
+from typing import Any
 from uuid import uuid4
 
 import click
@@ -281,7 +281,7 @@ class PluginMigration:
             return result
 
     @classmethod
-    def _fetch_plugin_unique_identifier(cls, plugin_id: str) -> Optional[str]:
+    def _fetch_plugin_unique_identifier(cls, plugin_id: str) -> str | None:
         """
         Fetch plugin unique identifier using plugin id.
         """