Add functionality to filter exam collections by archived status

generic/templates/generic/examcollection_list.html

@@ -4,6 +4,14 @@
 
 <h1 class="mb-4">Exam Collections</h1>
 
+<form method="get" class="mb-3" id="archive-filter-form">
+    <div class="form-check form-switch">
+        <input class="form-check-input" type="checkbox" id="showArchived" name="show_archived" value="1" onchange="this.form.submit()"
+               {% if request.GET.show_archived %}checked{% endif %}>
+        <label class="form-check-label" for="showArchived">Show archived collections</label>
+    </div>
+</form>
+
 {% if object_list %}
 <div class="row row-cols-1 row-cols-md-2 row-cols-lg-3 g-3">
     {% for collection in object_list %}