Summary: Fixes T3557. One thing which made T3557 kind of a mess was the lack of information about progress through temporary failures. Add a column which records a task's last failure time, and surface it in the console.
Test Plan: {F51277}
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T3557
Differential Revision: https://secure.phabricator.com/D6550
