Merge branch 'uwmsn-email' into 'master'

Chore: replace EPPN with email

This PR fixes an error in `PreauthUserDetailsProvider` where EPPN was being passed to the constructor in place of email, an artifact of the email attribute not being delivered by Shib until recently.

Please review: @ahoffmann @weizhong-wang @KJOYNER

See merge request !9