Publish Dataset: Show new version numbers in Publish Popup

[ekraffmiller]

In the JSF publish form, if the dataset was previously published, the form displays the new version numbers for the major and minor version updates, for example:

In the SPA, we need the version number of the most recently published version, in order to derive the new version numbers. This may require changes to js-dataverse and the dataverse API for the Get Dataset use case.