feat: move system-upgrade-controller to addons

Signed-off-by: Devin Buhl <devin@buhl.casa>

bootstrap/templates/kubernetes/apps/system-upgrade/kustomization.yaml.j2

@@ -3,7 +3,6 @@ apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 resources:
   - ./namespace.yaml
-  # NOTE: Only enable system-upgrade-controller if you also update the version of k3s in the following file
-  # otherwise if you run ansible against an already provisioned cluster you might downgrade it
-  # https://github.com/onedr0p/flux-cluster-template/blob/main/ansible/inventory/group_vars/kubernetes/main.yaml
-  # - ./system-upgrade-controller/ks.yaml
+  {% if system_upgrade_controller.enabled | default(false) %}
+  - ./system-upgrade-controller/ks.yaml
+  {% endif %}