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Dataset deletion should clean its elements first

Sentry Issue: ARKINDEX-BACKEND-1S0

ForeignKeyViolation: update or delete on table "training_dataset" violates foreign key constraint "training_datasetelem_dataset_id_3b1c9bdd_fk_training_" on table "training_datasetelement"
DETAIL:  Key (id)=(ca38c593-b556-4ad7-99e9-b4932a03e730) is still referenced from table "training_datasetelement".

  File "django/db/backends/base/base.py", line 306, in _commit
    return self.connection.commit()

IntegrityError: update or delete on table "training_dataset" violates foreign key constraint "training_datasetelem_dataset_id_3b1c9bdd_fk_training_" on table "training_datasetelement"
DETAIL:  Key (id)=(ca38c593-b556-4ad7-99e9-b4932a03e730) is still referenced from table "training_datasetelement".

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  File "django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "django/db/backends/base/base.py", line 330, in commit
    self._commit()
  File "django/db/backends/base/base.py", line 305, in _commit
    with self.wrap_database_errors:
  File "django/db/utils.py", line 91, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "django/db/backends/base/base.py", line 306, in _commit
    return self.connection.commit()