Slightly modernize NuanceQueue

Summary: Ref T8434. Touch things up a bit. This also cleans up the missing ApplicationTransactionInterface for T6367.

Test Plan: Didn't create a new queue. Didn't edit an existing queue.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: jeremyb, epriestley

Maniphest Tasks: T8434

Differential Revision: https://secure.phabricator.com/D13160