Add bulk "clear" to Browse - DAG Runs UI

Add bulk "clear" to Browse - DAG Runs UI: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). Airflow DAG Run UI (Browse - DAG Runs) is really useful for managing many DAG Runs, creating specific DAG Runs and so on. It would be great to have an additional option to…