Add OMNIAUTH_ONLY environment variable to enforce externa log-in (#17288)

* Remove support for OAUTH_REDIRECT_AT_SIGN_IN

Fixes #15959

Introduced in #6540, OAUTH_REDIRECT_AT_SIGN_IN allowed skipping the log-in form
to instead redirect to the external OmniAuth login provider.

However, it did not prevent the log-in form on /about introduced by #10232 from
appearing, and completely broke with the introduction of #15228.

As I restoring that previous log-in flow without introducing a security
vulnerability may require extensive care and knowledge of how OmniAuth works,
this commit removes support for OAUTH_REDIRECT_AT_SIGN_IN instead for the time
being.

* Add OMNIAUTH_ONLY environment variable to enforce external log-in only

* Disable user registration when OMNIAUTH_ONLY is set to true

* Replace log-in links When OMNIAUTH_ONLY is set with exactly one OmniAuth provider

app/views/layouts/public.html.haml

@@ -22,7 +22,7 @@
             - if user_signed_in?
               = link_to t('settings.back'), root_url, class: 'nav-link nav-button webapp-btn'
             - else
-              = link_to t('auth.login'), new_user_session_path, class: 'webapp-btn nav-link nav-button'
+              = link_to_login t('auth.login'), class: 'webapp-btn nav-link nav-button'
               = link_to t('auth.register'), available_sign_up_path, class: 'webapp-btn nav-link nav-button'
 
     .container= yield