In OpenAIRE/oai_datacite export, use `dateType` "Updated" for date of latest published version only after user has published more than one version

Overview of the Feature Request

To match what the DataCite/Datacite export does, the OpenAIRE/oai_datacite export should use the dateType "Updated" only when the user has published more than one version and to indicate when the user published the dataset's latest published version.

Currently, the OpenAIRE/oai_datacite export uses "Updated" to indicate when the latest version was published, even when the user published only one version.

This issue is part of a larger effort to align both metadata exports, described in https://github.com/IQSS/dataverse/issues/11916 and https://github.com/IQSS/dataverse/issues/12281.

What kind of user is the feature intended for?

API User, Superuser, and Sysadmin

What inspired the request?

This is part of a larger effort to align the OpenAIRE/oai_datacite and DataCite/Datacite metadata exports. There is more context at https://github.com/IQSS/dataverse/issues/11916 and https://github.com/IQSS/dataverse/issues/12281.

What existing behavior do you want changed?

Currently, the OpenAIRE/oai_datacite export uses "Updated" to indicate when the latest version was published, even when the user published only one version.

<date
    dateType="Updated">2025-12-07
</date>

The DataCite/Datacite export uses the "Updated" dateType only when the user has published more than one version of the dataset, to indicate when the user published the dataset's latest published version.

The OpenAIRE/oai_datacite export should be changed to use the "Updated" dateType and the "Available" dateTypein the same ways that the DataCite/Datacite export does.

Any open or closed issues related to this feature request?

• https://github.com/IQSS/dataverse/issues/11916
• https://github.com/IQSS/dataverse/issues/12281
• https://github.com/IQSS/dataverse-pm/issues/470

Compare the OpenAIRE/oai_datacite export with the DataCite/Datacite export, focusing on their dateType handling. Verify the XML for datasets with one published version and with multiple published versions; done means Updated and Available dates match the requested behavior.