Summary:
Fixes T12035. Normally, the "abc" -> "abc/" redirect is handled automatically when "abc" hits a 404.
However, in this case, "source/x" does not 404. We route this to a valid controller because some VCS requests omit the slashes, then manually perform the redirect if we aren't serving a VCS request.
Allow this controller to serve public resources so we can serve the redirect to logged-out users instead of prompting them to login so they can be redirected.
Test Plan: Visited `/source/x` as a logged-out user, where `x` is a public repository.
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T12035
Differential Revision: https://secure.phabricator.com/D17097
8640ab5fc3