feat: rename addon vars to addon_ prefix and simplify logic in jinja templates (#1216)

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

bootstrap/templates/kubernetes/apps/observability/kubernetes-dashboard/app/helmrelease.yaml.j2

@@ -1,4 +1,4 @@
-#% if kubernetes_dashboard|default({}) and kubernetes_dashboard.enabled|default(false) %#
+#% if addon_kubernetes_dashboard.enabled %#
 ---
 apiVersion: helm.toolkit.fluxcd.io/v2beta2
 kind: HelmRelease
@@ -31,7 +31,7 @@ spec:
     ingress:
       enabled: true
       className: internal
-      #% if homepage|default({}) and homepage.enabled|default(false) %#
+      #% if addon_homepage.enabled %#
       annotations:
         gethomepage.dev/enabled: "true"
         gethomepage.dev/icon: kubernetes-dashboard.png

bootstrap/templates/kubernetes/apps/observability/kubernetes-dashboard/app/kustomization.yaml.j2

@@ -1,4 +1,4 @@
-#% if kubernetes_dashboard|default({}) and kubernetes_dashboard.enabled|default(false) %#
+#% if addon_kubernetes_dashboard.enabled %#
 ---
 apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization

bootstrap/templates/kubernetes/apps/observability/kubernetes-dashboard/app/rbac.yaml.j2

@@ -1,4 +1,4 @@
-#% if kubernetes_dashboard|default({}) and kubernetes_dashboard.enabled|default(false) %#
+#% if addon_kubernetes_dashboard.enabled %#
 # For dashboard sign in token:
 # kubectl -n observability get secret kubernetes-dashboard -o jsonpath='{.data.token}' | base64 -d
 ---

bootstrap/templates/kubernetes/apps/observability/kubernetes-dashboard/ks.yaml.j2

@@ -1,4 +1,4 @@
-#% if kubernetes_dashboard|default({}) and kubernetes_dashboard.enabled|default(false) %#
+#% if addon_kubernetes_dashboard.enabled %#
 ---
 apiVersion: kustomize.toolkit.fluxcd.io/v1
 kind: Kustomization