Re-enable Pressable NUX flow

[brbrr]

Pressable NUX flow was blocked disabled due to some sort fo Pressable bug. As mentioned by Sean - we shouldn't create a new site for every test. Instead, we should wipe out existing site with some custom script. It might be easy to clean up all the DB tables and content, to simulate "the first run". One thing which is concerning me - how to reset/clear any rewind data on the backend and how to remove credentials from Rewind storage. That's one might be quite complicated, since we don't have any open APIs to manipulate rewind records.

Internal ref for discussion: p1535659602000200-slack-e2e-testing-discuss cc @seanosh