Auth: Refactored OIDC RP-logout PR code, Extracted logout

Extracted logout to the login service so the logic can be shared instead
of re-implemented at each stage. For this, the SocialAuthService was
split so the driver management is in its own class, so it can be used
elsewhere without use (or circular dependencies) of the
SocialAuthService.

During review of #4467

app/Users/Controllers/UserAccountController.php

@@ -2,7 +2,7 @@
 
 namespace BookStack\Users\Controllers;
 
-use BookStack\Access\SocialAuthService;
+use BookStack\Access\SocialDriverManager;
 use BookStack\Http\Controller;
 use BookStack\Permissions\PermissionApplicator;
 use BookStack\Settings\UserNotificationPreferences;
@@ -161,7 +161,7 @@ class UserAccountController extends Controller
     /**
      * Show the view for the "Access & Security" account options.
      */
-    public function showAuth(SocialAuthService $socialAuthService)
+    public function showAuth(SocialDriverManager $socialDriverManager)
     {
         $mfaMethods = user()->mfaValues()->get()->groupBy('method');
 
@@ -171,7 +171,7 @@ class UserAccountController extends Controller
             'category' => 'auth',
             'mfaMethods' => $mfaMethods,
             'authMethod' => config('auth.method'),
-            'activeSocialDrivers' => $socialAuthService->getActiveDrivers(),
+            'activeSocialDrivers' => $socialDriverManager->getActive(),
         ]);
     }