Modify publish endpoint to add `description` to DOI

[maxsibilla]

1. Modify the DataCiteDoiHelper to include a function to build the following description for the publishing payload:

"descriptions": [
        {
          "lang": "en-US",
          "description": <dataset.description>,
          "descriptionType": "Abstract"
        }
      ]

2. Write a script to modify existing DOIs to update the description (https://support.datacite.org/docs/updating-metadata-with-the-rest-api)

[maxsibilla]

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