Deprecating BrowseController and getting rid of unneeded calls to getTerseSummary() and getHumanStatus()

Summary: Ref T8050, Deprecating BrowseController and getting rid of unneeded calls to getTerseSummary() and getHumanStatus()

Test Plan: Use calendar, make sure nothing explodes

Reviewers: epriestley, Blessed Reviewers

Reviewed By: epriestley, Blessed Reviewers

Subscribers: Korvin, epriestley

Maniphest Tasks: T8050

Differential Revision: https://secure.phabricator.com/D12791