chore: extract overview partials

app/views/overview/index.html.erb

@@ -21,11 +21,15 @@
     </div>
     <%= render partial: "quality_framework_indicators", locals: { category_presenters: @category_presenters } %>
 
-<% if @page.show_response_rates  %>
+<% if @page.show_student_response_rates  %>
     <div class="overall-response-rate-row">
       <%= render partial: "response_rate", locals: {response_rate_presenter: @student_response_rate_presenter} %>
       <%= render partial: "response_rate", locals: {response_rate_presenter: @teacher_response_rate_presenter} %>
     </div>
+  <% else  %>
+    <div class="overall-response-rate-row">
+      <%= render partial: "response_rate", locals: {response_rate_presenter: @parent_response_rate_presenter} %>
+    </div>
   <% end %>
 
   </div>