ValidationError when sending a non-UUID or an UUID of a WorkerVersion that does not exist in ListTranscriptionEntities

Sentry Issue: ARKINDEX-BACKEND-1BR

ValidationError: {'worker_version': ['Invalid UUID.']}
(7 additional frame(s) were not displayed)
...
  File "rest_framework/views.py", line 506, in dispatch
    response = handler(request, *args, **kwargs)
  File "drf_spectacular/utils.py", line 448, in wrapped_method
    return method(self, request, *args, **kwargs)
  File "rest_framework/generics.py", line 199, in get
    return self.list(request, *args, **kwargs)
  File "rest_framework/mixins.py", line 38, in list
    queryset = self.filter_queryset(self.get_queryset())
  File "arkindex/documents/api/entities.py", line 307, in get_queryset

I am creating this issue just to document that this bug existed—this has been found by @vrigal and will be fixed in !1835 (merged). A ValidationError was thrown outside of a context where DRF would have caught it to cause HTTP 400, causing HTTP 500 instead. This occurs by sending ?worker_version=lol, or anything that isn't a UUID or is an UUID of a WorkerVersion that does not exist, to ListTranscriptionEntities.