Rename Drydock Lease STATUS_EXPIRED to STATUS_DESTROYED

Summary: Ref T9252. This is now more consistent (same as the equivalent Resource state) and accurate (leases can end up in this state a bunch of ways, including by expiring).

Test Plan: grep, browsed around web UI.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9252

Differential Revision: https://secure.phabricator.com/D14150