DuplicateId errors when indexing from deposits

https://sentry.softwareheritage.org/organizations/swh/issues/105298/?referrer=phabricator_plugin

DuplicateId: [{'id': 'https://inria.halpreprod.archives-ouvertes.fr/hal-02527778', 'indexer_configuration_id': 1}]
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  File "swh/indexer/metadata.py", line 184, in persist_index_computations
    return self.idx_storage.origin_extrinsic_metadata_add(results)
  File "swh/core/api/__init__.py", line 188, in meth_
    return self._post(meth._endpoint_path, post_data)
  File "swh/core/api/__init__.py", line 283, in _post
    return self._decode_response(response)
  File "swh/core/api/__init__.py", line 365, in _decode_response
    self.raise_for_status(response)
  File "swh/core/api/__init__.py", line 355, in raise_for_status
    raise exception from None

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Migrated from T4710 (view on Phabricator)