fixes https://github.com/TryGhost/Team/issues/3331
This adds attribution tracking to the signup form. It sends a newly
created url history when sending the signup API call, this url history
will get translated to a proper attribution and saved on the backend. We
send a history with only a single item that contains the referrer
source, medium and path of the Embed form.
This also makes some changes to the E2E tests so that the tests run
in an https environment instead of about:blank.
refs https://ghost.slack.com/archives/C02G9E68C/p1685446707169999
- `actions/setup-node` has a bug where it doesn't parse paths where the path is pretty-printed with colors, so we have to explicitly disable colors
- Added whitespace change inside signup-form to trigger new CI run
