Allow to export metadata of unpublished datasets using preview URL token

Overview of the Feature Request

We'd like to discuss the feature request of allowing users to view metadata exports of unpublished datasets using preview URL token.

The reasoning here is basically the same as for why viewing metadata exports of unpublished datasets is useful in general: users would like to check the metadata exports before publishing the dataset.

That was discussed in https://github.com/IQSS/dataverse/issues/4132 and implemented in https://github.com/IQSS/dataverse/pull/11398.

This feature request is only about adding a new method of authentication to do so (the preview URL token). As far as I am aware, this is currently not possible.

Any open or closed issues related to this feature request?

https://github.com/IQSS/dataverse/issues/4132

Are you thinking about creating a pull request for this feature?
Help is always welcome, is this feature something you or your organization plan to implement?

Yes, we would

Start by reading issue 4132 and pull request 11398 to understand the existing metadata export behavior for unpublished datasets. Then trace how preview URL tokens are authenticated; done means an unpublished dataset's metadata export can be viewed with a valid preview URL token without weakening other access controls.