Continued review of #2169

- Removed uneeded custom refresh or logout actions for OIDC.
- Restructured how the services and guards are setup for external auth
  systems. SAML2 and OIDC now directly share a lot more logic.
- Renamed any OpenId references to OIDC or OpenIdConnect
- Removed non-required CSRF excemption for OIDC

Not tested, Come to roadblock due to lack of PHP8 support in upstream
dependancies. Certificate was deemed to be non-valid on every test
attempt due to changes in PHP8.

app/Http/Middleware/VerifyCsrfToken.php

@@ -20,6 +20,5 @@ class VerifyCsrfToken extends Middleware
      */
     protected $except = [
         'saml2/*',
-        'openid/*',
     ];
 }