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/rag/entities/metadata_entities.py

@@ -1,5 +1,5 @@
 from collections.abc import Sequence
-from typing import Literal, Optional
+from typing import Literal
 
 from pydantic import BaseModel, Field
 
@@ -43,5 +43,5 @@ class MetadataCondition(BaseModel):
     Metadata Condition.
     """
 
-    logical_operator: Optional[Literal["and", "or"]] = "and"
-    conditions: Optional[list[Condition]] = Field(default=None, deprecated=True)
+    logical_operator: Literal["and", "or"] | None = "and"
+    conditions: list[Condition] | None = Field(default=None, deprecated=True)