[Redesign] Add ActionIcon to home panels
Summary: Ref T8099, adds an action icon similar to dashboards for taking people to the search.
Test Plan: Click on each icon, verify it takes me to correct URL.
Reviewers: btrahan, epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T8099
Differential Revision: https://secure.phabricator.com/D12974