code: def _remove_event_source(awsclient, evt_source, lambda_arn):
      
      event_source_obj = _get_event_source_obj(awsclient, evt_source)
      if event_source_obj.exists(lambda_arn):
          event_source_obj.remove(lambda_arn)
docs: Given an event_source dictionary, create the object and remove the event source.