Fix some small notification / token issues
Summary:
Fixes T3218.
- Currently, Paste pages don't clear notifications about the paste (notably, token notifications).
- Currently, Paste pages don't show tooltips on tokens.
- buildApplicationPage() stopped respecting pageObjects (which controls whether "this page has been updated" is shown). Restore that.
- Make pageObjects imply "clear notifications on this stuff".
Test Plan: Viewed a tokened Paste. Verified it cleared the notification and hovering over a token showed a tip.
Reviewers: btrahan, chad
Reviewed By: chad
CC: aran
Maniphest Tasks: T3218
Differential Revision: https://secure.phabricator.com/D5971