Show commits and revisions on tasks in a tabular view instead of handle lists

Summary: Depends on D20882. Ref T13440. Instead of lists of "Differential Revisions" and "Commits", show all changes related to the task in a tabular view.

Test Plan: {F6989816}

Maniphest Tasks: T13440

Differential Revision: https://secure.phabricator.com/D20883