Added full flow test for click tracking (#15546)
Added full flow test for click tracking (#15546)

refs https://github.com/TryGhost/Team/issues/1967

This tests the full flow of publishing a newsletter, and then checking
that clicked links will increase the click count, generate events for
the member which clicked the link as well as the redirects contain the
correct query params.


TryGhost/Ghost,TryGhost/Ghost,TryGhost/Ghost