feat(cilium): loadbalancer mode default to dsr and allow configurability

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

bootstrap/templates/kubernetes/apps/kube-system/cilium/app/helm-values.yaml.j2

@@ -43,7 +43,7 @@ l2announcements:
   #% endif %#
 loadBalancer:
   algorithm: maglev
-  mode: snat
+  mode: "#{ bootstrap_loadbalancer_mode|default('dsr', true) }#"
 localRedirectPolicy: true
 operator:
   replicas: 1