Merge "Table of Contents", "Local Commits", "Update History" and "Similar Revisions"

Summary: Ref T10628. Turn these into tabs in a single box, since "local commits" and "similar revisions" are of particularly rare use.

Test Plan: {F1707196}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10628

Differential Revision: https://secure.phabricator.com/D16209