Extracting initializing blocks to higher level

I want to test embargo_release_date and the ability class; By extracting
the initialization methods, I can reuse that logic in my embargo tests.
Moving senior thesis ability specs to lower block

I want to test embargo release dates, so I'm making room for that.
Delegating CurationConcern#under_embargo?
Implementing functional embargo behavior

This is not complete, in that the UI has a "surprise" in that the
embargo release date should only be available if the permission is
Open Access.