feat: show MFA status on Super Admin user page (#13724)

This PR adds an MFA row to the individual Super Admin user page and
shows the current state as Enabled or Disabled with a compact status
badge.

Fixes #13723

## Screens

<img width="1370" height="1043" alt="image"
src="https://github.com/user-attachments/assets/b9fee284-43b7-4bbb-9f60-b71ab34b96b7"
/>


<img width="1370" height="1043" alt="image"
src="https://github.com/user-attachments/assets/23c5e6d3-24b8-40d2-9134-0c2b1dc98b41"
/>

app/views/super_admin/users/show.html.erb

@@ -53,6 +53,14 @@ as well as a link to its edit page.
         <% end %>
       </fieldset>
     <% end %>
+
+    <dt class="attribute-label" id="mfa_enabled">MFA</dt>
+    <dd class="attribute-data attribute-data--string">
+      <% mfa_enabled = page.resource.mfa_enabled? %>
+      <span class="<%= mfa_enabled ? 'bg-green-100/70 text-green-800' : 'bg-slate-100 text-slate-700' %> inline-flex items-center px-2 h-4 leading-4 rounded-xl text-xxs font-medium">
+        <%= mfa_enabled ? 'Enabled' : 'Disabled' %>
+      </span>
+    </dd>
   </dl>
 </section>