[Admin] Disable Turbo Caching and Prefetching

We don't want to deal with Turbo caching issues in the new admin.
The content a customer agent or product administrator should always be
the latest and most accurate version.

Prefetching is a performance nightmare for an admin interface like ours.

Co-authored-by: Eugene Chaikin <[email protected]>

Author: tvdeyen

admin/app/views/layouts/solidus_admin/application.html.erb

@@ -5,6 +5,9 @@
 
     <title><%= solidus_admin_title %></title>
     <meta name="viewport" content="width=device-width,initial-scale=1">
+    <meta name="turbo-cache-control" content="no-cache">
+    <meta name="turbo-prefetch" content="false">
+
     <%= csrf_meta_tags %>
     <%= csp_meta_tag %>