This commit fixes a problem where the user will not be able to reset
their password when they only have security keys and backup codes
configured.
This commit also makes the following changes/fixes:
1. Splits password reset system tests to
`spec/system/forgot_password_spec.rb` instead of missing the system
tests in `spec/system/login_spec.rb` which is mainly used to test
the login flow.
2. Fixes a UX issue where the `Use backup codes` or `Use authenticator
app` text is shown on the reset password form when the user does
not have either backup codes or an authenticator app configured.
