Make all users applicants

Because the login path for ardc is a little different, the upstream method of how new users become applicants does not apply fully. A quick override to just make all new users (through the passwordless system) applicants solves a lot of further issues down the line, and is more in line with how the ARDC branch worked. This code could probably be removed later if the two reigstration systems are brought in line.

This also resolves an issue where the post-draft screen asked the user to log in (issue ots/clients/ardc/hypha-tracker#308)

Issue ots/clients/ardc/hypha-tracker#309: As a new user, saving an application as a draft doesn't assign the applicant role to the user