Properly set start_date for cleared tasks #18708
Merged
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This PR ensures that when we clear task instances, the start_date for the dagrun is set correctly.
If the dag_run_state is queued we should set the start_date to None otherwise start_date should be
set to timezone.utcnow
Also, in the clear task instances API endpoint, the state of the dagrun is being set to RUNNING on
clear. This PR addresses it too.
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