Add a "Date Updated (Oldest First)" sort order to Maniphest

Summary: Closes T8484

Test Plan: Create sample tasks then navigate to Maniphest > Advanced Search and choose choose "Date Updated (Oldest First)" in the "Order By" select box.

Reviewers: lpriestley, epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: epriestley, Korvin

Maniphest Tasks: T8484

Differential Revision: https://secure.phabricator.com/D13237