Description of problem:

When I cancel a subtask of a job, the job doesn't know and doesn't show it as cancelled.

How reproducible:

Deterministic

Is this issue a regression from an earlier version:

Reproduced in Sat 6.18 snap 6.0. This happens in the new REX UI. In legacy UI, it wasn't possible to cancel a subtask.

Steps to Reproduce:

1. Have a Satellite  with 4 hosts registered

2. In Hosts, select hosts and "Schedule a job"

3. On the second tab, set script to `echo $(date) > /tmp/test; sleep 60; echo done >> /tmp/test;`

4. On the third tab, set concurrency to 2

5. Submit

6. Select all the subtasks and in the kebab menu, "Cancel selected"

7. Go to Monitor -> Satellite Tasks -> Tasks

8. Click the parent task and then Dynflow Console

9. On the Run tab, select the RunHostsJob task

Actual behavior

Output:

---
host_count: 4
remote_triggered_count: 4
planned_count: 4
cancelled_count: 0
total_count: 4
failed_count: 2
pending_count: 0
success_count: 2 

Expected behavior:
The tasks should be reported as cancelled