Fix 2FA challenge and password challenge for non-database users #11831
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Fix #11685
Previous code (inspired by GitLab) handled 2FA before Devise performed its own authentication, duplicating the work, and, in case of non-database users (LDAP, PAM), doing the wrong kind of work. Now authentication is delegated to Devise/Warden, then once we have the user, we check the 2FA requirement, and handle OTP/recovery token.
Fix #11691
It is not possible to re-authenticate non-database users just from password input when confirming account deletion. So, for those users, use a simple username repetition challenge instead of confirming password.