Async Delete: Correct instances of multiple audit log entries for delete

[Maffooch]

Correcting the following:

Traceback (most recent call last):
  File "/usr/local/lib/python3.11/site-packages/celery/app/trace.py", line 453, in trace_task
    R = retval = fun(*args, **kwargs)
                 ^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/celery/app/trace.py", line 736, in __protected_call__
    return self.run(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/dojo/utils.py", line 2331, in delete_chunk
    obj.delete()
  File "/app/dojo/models.py", line 1614, in delete
    super().delete(*args, **kwargs)
  File "/usr/local/lib/python3.11/site-packages/django/db/models/base.py", line 1273, in delete
    return collector.delete()
           ^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/django/db/models/deletion.py", line 508, in delete
    signals.post_delete.send(
  File "/usr/local/lib/python3.11/site-packages/django/dispatch/dispatcher.py", line 189, in send
    response = receiver(signal=self, sender=sender, **named)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/dojo/engagement/signals.py", line 43, in engagement_post_delete
    le = LogEntry.objects.get(
         ^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/django/db/models/manager.py", line 87, in manager_method
    return getattr(self.get_queryset(), name)(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/django/db/models/query.py", line 652, in get
    raise self.model.MultipleObjectsReturned(
auditlog.models.LogEntry.MultipleObjectsReturned: get() returned more than one LogEntry -- it returned 2!

[dryrunsecurity]

No security concerns detected in this pull request.

---

All finding details can be found in the DryRun Security Dashboard.

[mtesauro]

Approved