[1.x] Naming 2FA routes for consistency

[schonhoff]

After I included Fortify in an old Laravel project (with laravel ui), I was forced myself to use the url() helper instead the route() helper because some routes had no names on it. I added names to the following routes:
/user/two-factor-authentication => two-factor.toggle
/user/two-factor-qr-code => two-factor.qr-code
/user/two-factor-recovery-codes => two-factor.recovery-codes

Now I can use:

<form method="POST" action="{{ route('two-factor.toggle') }}">
  [...]
</form>

instead

<form method="POST" action="{{ url('/user/two-factor-authentication') }}">
  [...]
</form>

like other routes of Fortify. I used toggle because it enables and disables the 2FA for the user. Maybe a better name is found for that.

The tests can be modified to use route() helper but I don't know if that is really necessary.