[v3-3-test] Fix Grid view failing to load large Dags on MySQL (#71342) (#71370)

* Fix Grid view failing to load large Dags on MySQL

* Remove unnecessary comment
(cherry picked from commit fe5107f)

Co-authored-by: WonYong Jang <zcx5674@gmail.com>
Co-authored-by: Rahul Vats <43964496+vatsrahul1001@users.noreply.github.com>

Author: 3 people

airflow-core/src/airflow/api_fastapi/core_api/routes/ui/grid.py

@@ -80,14 +80,7 @@
 
 
 def _get_latest_serdag(dag_id, session):
-    serdag = session.scalar(
-        select(SerializedDagModel)
-        .where(
-            SerializedDagModel.dag_id == dag_id,
-        )
-        .order_by(SerializedDagModel.id.desc())
-        .limit(1)
-    )
+    serdag = session.scalar(SerializedDagModel.latest_item_select_object(dag_id))
     if not serdag:
         raise HTTPException(
             status.HTTP_404_NOT_FOUND,