Fix Dag Details start date bug (#16206)
Fix Dag Details start date bug (#16206)

* Only show Start Date when catchup=True

* add catchup field to details

* add started field for catchup=false dags
nathanielvarona/airflow,cfei18/incubator-airflow,danielvdende/incubator-airflow,apache/airflow,dhuang/incubator-airflow,lyft/incubator-airflow,Acehaidrey/incubator-airflow,danielvdende/incubator-airflow,danielvdende/incubator-airflow,danielvdende/incubator-airflow,lyft/incubator-airflow,nathanielvarona/airflow,lyft/incubator-airflow,cfei18/incubator-airflow,mistercrunch/airflow,apache/airflow,apache/incubator-airflow,bolkedebruin/airflow,lyft/incubator-airflow,bolkedebruin/airflow,mistercrunch/airflow,bolkedebruin/airflow,dhuang/incubator-airflow,nathanielvarona/airflow,apache/incubator-airflow,Acehaidrey/incubator-airflow,cfei18/incubator-airflow,nathanielvarona/airflow,cfei18/incubator-airflow,dhuang/incubator-airflow,bolkedebruin/airflow,danielvdende/incubator-airflow,danielvdende/incubator-airflow,Acehaidrey/incubator-airflow,mistercrunch/airflow,mistercrunch/airflow,apache/airflow,nathanielvarona/airflow,apache/incubator-airflow,cfei18/incubator-airflow,cfei18/incubator-airflow,apache/airflow,apache/airflow,dhuang/incubator-airflow,Acehaidrey/incubator-airflow,apache/incubator-airflow,nathanielvarona/airflow,Acehaidrey/incubator-airflow,apache/airflow,bolkedebruin/airflow,Acehaidrey/incubator-airflow