Tidy up some Drydock UI

Summary: Ref T9253. We had some un-modern use of UI elements, clean that up. Add a tab for showing slot locks so you don't have to fish around in the database.

Test Plan: Looked at blueprints, resources and leases. Looked at slot locks.

Reviewers: chad, hach-que

Reviewed By: chad, hach-que

Maniphest Tasks: T9253

Differential Revision: https://secure.phabricator.com/D14119