Show broken units in revision history
This is hacky, and I'm not sure I'm happy with it; Until T9365 is done, this will show up
broken tests with an appropriate star in the Revision History.
Test Plan: Created 1M messages in a couple of old diffs in a revision. The query took ~80us (On SSD drive).
Reviewers: Blessed Reviewers, epriestley
Reviewed By: Blessed Reviewers, epriestley
Differential Revision: https://secure.phabricator.com/D16483