Provide a clearer UI for "view all results" in partial result panels

Summary:
In some cases, we show a limited number of one type of object somewhere else, like "Recent Such-And-Such" or "Herald Rules Which Use This" or whatever.

We don't do a very good job of communicating that these are partial lists, or how to see all the results. Usually there's a button in the upper right, which is fine, but this could be better.

Add an explicit "more stuff" button that shows up where a pager would appear and makes it clear that (a) the list is partial; and (b) you can click the button to see everything.

Test Plan:

Reviewers: amckinley

Reviewed By: amckinley

Subscribers: PHID-OPKG-gm6ozazyms6q6i22gyam

Differential Revision: https://secure.phabricator.com/D20315