text: Title: FAB auth manager doesn't show error messages on failed log in
  Body: ### Apache Airflow version
  
  3.0.0
  
  ### What happened?
  
  When you end up on`http://127.0.0.1:9091/auth/login/` (I think this is the FAB auth manager| Maybe it'sand enter gibberish you just get redirected to the same page with no indication of an error.
  
  
  
  