Summary:
Ref T10457. When tests fail, it currently takes several clicks to figure out //why// they failed.

In this project, map rebuilds and `liberate` are fairly common failure conditions, but verifying that they were the root issue requires jumping into a build, then scrolling through a log.

Instead, display details if they're available.

Test Plan:
Before:

{F1135453}

After:

{F1135454}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9951, T10457

Differential Revision: https://secure.phabricator.com/D15363