Put nav item behind feature flag

app/views/layouts/nav/sidebar/_group.html.haml

@@ -159,7 +159,7 @@
               = link_to group_settings_ci_cd_path(@group), title: _('CI / CD') do
                 %span
                   = _('CI / CD')
-
+            - if Feature.enabled?(:group_level_integrations, @group)
               = nav_link(controller: :integrations) do
                 = link_to group_settings_integrations_path(@group), title: _('Integrations') do
                   %span