Adding these two labels to the test project gives us better coverage
of the copyCondition and submit-requirment setup of projects.
Review-Priority is voting, so has a blocking s-r. Backport-Candidate
is an example of a non-voting (or "trigger" as gerrit calls it) label,
which should show up in a different part of the UI.
This should help us better evaluate any changes in this area,
particularly UI changes via our test screenshots.
Change-Id: Ib42fa61d9805d1946da7307f0969cdaf6a937514
927d5730b8