code: public static void cleanStagingData(List<? extends State> states, Logger logger) throws IOException {
      for (State state : states) {
        JobLauncherUtils.cleanTaskStagingData(state, logger);
      }
    }
docs: Cleanup the staging data for a list of Gobblin tasks. This method calls the
  {@link #cleanTaskStagingData(State, Logger)} method.
  
  @param states a {@link List} of {@link State}s that need their staging data cleaned