Restrict retention policy UI to admins

Update process edit view to only display the case retention policy card when the feature is enabled and the current user is an administrator. The Blade conditional in resources/views/processes/edit.blade.php now requires both config('app.case_retention_policy_enabled') and auth()->user()->is_administrator to prevent non-admins from seeing the retention settings.

Author: sanjacornelius

resources/views/processes/edit.blade.php

@@ -347,7 +347,7 @@ class="invalid-feedback"
                                 </div>
                             </div>
 
-                            @if(config('app.case_retention_policy_enabled'))
+                            @if(config('app.case_retention_policy_enabled') && auth()->user()->is_administrator)
                             <div class="card card-custom-info">
                               <div class="card-header"
                                    id="headingCasesRetention">