Fix linkifying text for users that don't own the review request.

We were only linkifying text for users that could edit the review request,
which made it kind of pointless. We now make sure to linkify regardless of
the user.

A unit test was added to check for this breakage.

Before this change, the unit test failed to find the linked element. After this change, the unit test passed, and I could see linkified text when logged out.