Support "select" types in bulk editor (status, priority)

Summary: Depends on D18864. Ref T13025. Adds bulk edit support back for "status" and "priority" using <select /> controls.

Test Plan:
Used bulk editor to change status and priority for tasks.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13025

Differential Revision: https://secure.phabricator.com/D18866