depends_on logic leaves floating tasks if dependent tasks upstream fail

[arik-shurygin]

when launching tasks with a depends_on task_ids. If those task_ids exit with a failure task the dependent job will hang indefinitely.

Can we figure out how to make downstream tasks auto-fail if their dependent tasks fail? Or even better add the ability for the user to specify if they want their dependent task to run regardless of status, or only on successful completion.