feat(container)!: Update image app-template to v3 (#1370)

* feat(container)!: Update image app-template to v3

* Update helmrelease.yaml.j2

* Update helmrelease.yaml.j2

* Update helmrelease.yaml.j2

* Update README.md

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Devin Buhl <onedr0p@users.noreply.github.com>

bootstrap/templates/kubernetes/apps/system-upgrade/system-upgrade-controller/app/helmrelease.yaml.j2

@@ -8,7 +8,7 @@ spec:
   chart:
     spec:
       chart: app-template
-      version: 2.6.0
+      version: 3.0.3
       sourceRef:
         kind: HelmRepository
         name: bjw-s
@@ -22,10 +22,10 @@ spec:
       retries: 3
   values:
     controllers:
-      main:
+      system-upgrade-controller:
         strategy: RollingUpdate
         containers:
-          main:
+          app:
             image:
               repository: docker.io/rancher/system-upgrade-controller
               tag: v0.13.4
@@ -74,9 +74,6 @@ spec:
     serviceAccount:
       create: true
       name: system-upgrade
-    service:
-      main:
-        enabled: false
     persistence:
       tmp:
         type: emptyDir