R1:3f1ee67972ac

Add a tooltip option to Link menu items

Summary: Ref T12174. Let's users add a tooltip to LinkProfileMenuItem

Test Plan: Add a tooltip, remove tooltip. Menu appears as expected

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T12174

Differential Revision: https://secure.phabricator.com/D17437