Revert "Order test-history page according to commit date rather than build date"
Revert "Order test-history page according to commit date rather than build date"

Summary: We dont really trust the commit date; will re-commit using `vcs.list` instead

Test Plan: Backout

Reviewers: josiah, jukka, mkedia

Reviewed By: mkedia

Subscribers: changesbot, mkedia, wwu

Differential Revision: https://tails.corp.dropbox.com/D106848

wfxiang08/changes,bowlofstew/changes,bowlofstew/changes,dropbox/changes,wfxiang08/changes,bowlofstew/changes,dropbox/changes,wfxiang08/changes,dropbox/changes,wfxiang08/changes,dropbox/changes,bowlofstew/changes