Load consuming_dags attr eagerly before dataset listener (#36247)

Previously, we could get detached instance error if the dataset listener code closes the session (which happens e.g. if BaseHook.get_connection is called).  By eager loading the attribute (which we need anyway), we can avoid this problem.

(cherry picked from commit 5bd3581)

airflow/datasets/manager.py

@@ -20,6 +20,7 @@
 from typing import TYPE_CHECKING
 
 from sqlalchemy import exc, select
+from sqlalchemy.orm import joinedload
 
 from airflow.configuration import conf
 from airflow.datasets import Dataset
@@ -63,7 +64,11 @@ def register_dataset_change(
         For local datasets, look them up, record the dataset event, queue dagruns, and broadcast
         the dataset event
         """
-        dataset_model = session.scalar(select(DatasetModel).where(DatasetModel.uri == dataset.uri))
+        dataset_model = session.scalar(
+            select(DatasetModel)
+            .where(DatasetModel.uri == dataset.uri)
+            .options(joinedload(DatasetModel.consuming_dags))
+        )
         if not dataset_model:
             self.log.warning("DatasetModel %s not found", dataset)
             return