[PR] Fix handle missing DAGs when clearing task instances to prevent failures. [airflow]

["jieyao-MilestoneHub (via GitHub)" <gi...@apache.org>]

jieyao-MilestoneHub opened a new pull request, #44422:
URL: https://github.com/apache/airflow/pull/44422

   This PR handle missing DAGs when clearing task instances to prevent failures. When we delete DAG files and attempt to trigger them again, the process should access the DAGs and display an error indicating that the DAGs no longer exist, rather than causing the frontend to show an "Oops" error.
   
   ### Summary of Changes:
   - Added warning logs for missing DAGs to prevent silent failures during task clearing.
   - Improved error handling for downstream task clearing, including checks for partial_subset errors to handle cases where DAGs or downstream dependencies are unavailable.
   - Updated the docstring for _clear_task_instances for better clarity and consistent style.
   - Refined the grouping and handling of Task Instances by DAG and DAG Run to improve robustness and maintainability.
   
   
   ### Issue Reference:
   Closes https://github.com/apache/airflow/issues/44274
   
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Re: [PR] Fix handle missing DAGs when clearing task instances to prevent failures. [airflow]

["jieyao-MilestoneHub (via GitHub)" <gi...@apache.org>]

jieyao-MilestoneHub closed pull request #44422: Fix handle missing DAGs when clearing task instances to prevent failures.
URL: https://github.com/apache/airflow/pull/44422


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