Add grade filter to user search widget and enhance logging for bulk add operations

generic/templates/generic/partials/user_search_widget_results.html

@@ -1,7 +1,7 @@
 {% if results %}
-  <ul class="list-unstyled mb-0">
+  <ul class="list-unstyled mb-0" id="user_search_results_list_{{ field }}">
     {% for item in results %}
-      <li class="py-1 d-flex justify-content-between align-items-center">
+      <li class="py-1 d-flex justify-content-between align-items-center" data-user-id="{{ item.id }}" data-user-text="{{ item.text|escapejs }}">
         <div class="flex-grow-1">{{ item.text|escape }}</div>
         <div>
           <button type="button" class="btn btn-sm btn-primary" onclick="addUserToField('{{ field }}', {{ item.id }}, '{{ item.text|escapejs }}')">Add</button>
@@ -9,6 +9,11 @@
       </li>
     {% endfor %}
   </ul>
+  {% if results %}
+    <div class="mt-2 text-end">
+      <button type="button" class="btn btn-sm btn-outline-success" onclick="addAllFromResults('{{ field }}')">Add all results</button>
+    </div>
+  {% endif %}
 {% else %}
   <div><em>No users found</em></div>
 {% endif %}