Show unit test namespaces

Summary: Show the full unit test name, including the namespace. Depends on D11208.

Test Plan: Inspected the "Table of Contents" of a diff created with D11208 and without D11208 applied.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11209