Move Dashboard and Panel edit history out of the way
Summary: Fixes T5170, Create new page for dashboard history
Test Plan: Open dashboard, manage dashboard, click on "View History". Dashboard history should appear. Panel history should appear on panel view page under panel.
Reviewers: epriestley, Blessed Reviewers
Reviewed By: epriestley, Blessed Reviewers
Subscribers: epriestley, Korvin
Maniphest Tasks: T5170
Differential Revision: https://secure.phabricator.com/D9280