feat: remove the need for raw jinja blocks (#1158)

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

bootstrap/templates/kubernetes/apps/tools/system-upgrade-controller/plans/agent.yaml.j2

@@ -1,4 +1,4 @@
-{% if bootstrap_distribution == "k3s" and system_upgrade_controller.enabled | default(false) %}
+<% if bootstrap_distribution == "k3s" and system_upgrade_controller.enabled | default(false) %>
 ---
 apiVersion: upgrade.cattle.io/v1
 kind: Plan
@@ -17,4 +17,4 @@ spec:
     args: ["prepare", "server"]
   upgrade:
     image: rancher/k3s-upgrade
-{% endif %}
+<% endif %>