Refactor worthwhile to rely on hydra-works

[flyingzumwalt]

• [ ] Replace Worthwhile::GenericFileBase with CurationConcern::FileBehaviors, which relies on Hydra::Works::FileBehaviors for most of its functionality instead of relying on Sufia::GenericFile and Worthwhile::Work
• [ ] Refactor CurationConcern::Work to rely on Hydra::Works::WorkBehaviors. Remove any redundant code

See Code Shredding doc for a guide