Keeps the dashboard sessions from expiring. (#9263)

* Keeps the dashboard sessions from expiring.
Route dashboard ajax calls through Laravel.
Boots minimal cookies and sessions.
Does not fix other pages for now, real fix is to fully port.

* Check Laravel auth for the legacy calls.
Display Laravel errors in the dashboard.
legacy auth checks are mostly extraneous now.

app/Http/Controllers/LegacyController.php

@@ -21,4 +21,14 @@ class LegacyController extends Controller
     {
         include base_path('html/legacy_api_v0.php');
     }
+
+    public function dash()
+    {
+        ob_start();
+        include base_path('html/legacy/ajax_dash.php');
+        $output = ob_get_contents();
+        ob_end_clean();
+
+        return response($output, 200, ['Content-Type' => 'application/json']);
+    }
 }