Log info not error in schedule when task has failure (apache#42116)

You have to think about the context where this is emitted.  It is emitted in the scheduler.  It's not a scheduler error.

airflow/models/dagrun.py

@@ -823,7 +823,7 @@ def recalculate(self) -> _UnfinishedStates:
 
         # if all tasks finished and at least one failed, the run failed
         if not unfinished.tis and any(x.state in State.failed_states for x in tis_for_dagrun_state):
-            self.log.error("Marking run %s failed", self)
+            self.log.info("Marking run %s failed", self)
             self.set_state(DagRunState.FAILED)
             self.notify_dagrun_state_changed(msg="task_failure")