Add actions to stop & restart a ponos task
Depends on https://gitlab.com/arkindex/ponos/-/issues/94
We need a single new action button on the task header, just before "Raw logs":
- "Stop task" when the task is running
- "Restart task" when the task is in a final state
Clicking on the button would trigger a call to PartialUpdateTask
, to update the state task accordingly.