ValueError: swh:1:dir:... has duplicated entry name: b'crypto'

Sentry Issue: SWH-SCRUBBER-20

ValueError: swh:1:dir:8041a84d492ac6e8608627a0cef0844c312a5bab has duplicated entry name: b'crypto'
(18 additional frame(s) were not displayed)
...
  File "swh/scrubber/storage_checker.py", line 216, in _check_partition
    objects = list(directory_get_many(self.storage, directory_ids))
  File "swh/storage/algos/directory.py", line 62, in directory_get_many
    raw_manifest=raw_manifests[directory_id],
  File "<attrs generated init swh.model.model.Directory>", line 7, in __init__
    Implementation of Software Heritage's data model
  File "attr/_make.py", line 2975, in __call__
    v(inst, attr, value)
  File "swh/model/model.py", line 1190, in check_entries
    f"swh:1:dir:{hash_to_hex(self.id)} has duplicated entry name: "