Add developer UI for accessing NUX and "Overheated" query states
Summary: Ref T11773. Not committed to this implementation, but adds some "Developer" query actions to jump to the nux/overheated states without needing to know secret magic URL variables.
Test Plan: {F1878984}
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T11773
Differential Revision: https://secure.phabricator.com/D16736