R1:d436fecdab19

Show additional details for failed builds in Harbormaster

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

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