…and hub (#495)

* Opt-in to emails by default on account creation in panel and hub. Remove checkboxes

* Update snapshots

* Add function to proptypes

* Remove opt into emails entirely

* Update styling after removing checkbox; approved by design team

* Remove promotion unit tests and scss

Co-authored-by: Ethan Gooding <32471984+Eden12345@users.noreply.github.com>
Co-authored-by: Christopher Tino <4699516+christophertino@users.noreply.github.com>