Add isReleased field to GET dataverse API response

[ekraffmiller]

Overview of the Feature Request For the SPA, we need to display the Unpublished label on the collections page if the Dataverse Collection hasn't been released.

What kind of user is the feature intended for? API User

What inspired the request? Collections Page of the SPA

What existing behavior do you want changed? add isReleased to the response of View Dataverse Collection. https://guides.dataverse.org/en/latest/api/native-api.html#view-a-dataverse-collection

Any brand new behavior do you want to add to Dataverse?

Any open or closed issues related to this feature request?