feat: duplicate an accommodation booking into a new draft

addresses #869f6z44f

templates/admin/accommodation_booking/show.html.twig

@@ -291,6 +291,13 @@
             {% if app.request.query.get('r') %}
                 {% set edit_params = edit_params | merge({ 'r': app.request.query.get('r') }) %}
             {% endif %}
+            <button type="button"
+                    class="button button--secondary button--small"
+                    hx-get="{{ path('app_admin_accommodationbooking_duplicate', edit_params) }}"
+                    hx-target="body"
+                    hx-swap="beforeend">
+                duplizieren
+            </button>
             <a href="{{ path('app_admin_accommodationbooking_edit', edit_params) }}" class="button button--primary button--small">
                 bearbeiten
             </a>