Backport #19119
If the mailer is configured then even if Manual confirm is set an activation email
is still being sent because `handleUserCreated` is not checking for this case.
Fix#17263
Signed-off-by: Andrew Thornton <art27@cantab.net>
Migrate from U2F to Webauthn
Co-authored-by: Andrew Thornton <art27@cantab.net>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>