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Considering the airflow documentation and ticket from Eyereturn,
The last task in the DAG is a dummy operator and display a GREEN color in airflow UI whenever all the tasks ran.
However it does not consider if the tasks are successful, hence we can follow Airflow doc and add ALL_SUCCESS instead
https://airflow.apache.org/docs/apache-airflow/stable/concepts/dags.html#concepts-trigger-rules