Update log level in scheduler critical section edge case (#30694)

This log message can be useful if the scheduler ends up needing to query
TIs more than once per scheduler loop, so make it INFO vs DEBUG to
increase discoverability.

(cherry picked from commit 3f5280b)

airflow/jobs/scheduler_job_runner.py

@@ -598,8 +598,8 @@ def _executable_task_instances_to_queued(self, max_tis: int, session: Session) -
  if is_done or not found_new_filters:
  break
 
- self.log.debug(
- "Found no task instances to queue on the %s. iteration "
+ self.log.info(
+ "Found no task instances to queue on query iteration %s "
  "but there could be more candidate task instances to check.",
  loop_count,
  )