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/core/tools/tool_file_manager.py

@@ -6,7 +6,7 @@ import os
 import time
 from collections.abc import Generator
 from mimetypes import guess_extension, guess_type
-from typing import Optional, Union
+from typing import Union
 from uuid import uuid4
 
 import httpx
@@ -72,10 +72,10 @@ class ToolFileManager:
         *,
         user_id: str,
         tenant_id: str,
-        conversation_id: Optional[str],
+        conversation_id: str | None,
         file_binary: bytes,
         mimetype: str,
-        filename: Optional[str] = None,
+        filename: str | None = None,
     ) -> ToolFile:
         extension = guess_extension(mimetype) or ".bin"
         unique_name = uuid4().hex
@@ -112,7 +112,7 @@ class ToolFileManager:
         user_id: str,
         tenant_id: str,
         file_url: str,
-        conversation_id: Optional[str] = None,
+        conversation_id: str | None = None,
     ) -> ToolFile:
         # try to download image
         try:
@@ -217,7 +217,7 @@ class ToolFileManager:
 
         return blob, tool_file.mimetype
 
-    def get_file_generator_by_tool_file_id(self, tool_file_id: str) -> tuple[Optional[Generator], Optional[ToolFile]]:
+    def get_file_generator_by_tool_file_id(self, tool_file_id: str) -> tuple[Generator | None, ToolFile | None]:
         """
         get file binary