Add support for ambient flag for integrated packages

As a follow up to creating a Big Bang toggle to enable ambient packages (ztunnel, gateway-api, istio-cni), we should also opt all Big Bang packages into ambient mode if the toggle is enabled.

This would mostly include adjusting the annotation on the namespace for each package to include the following logic:

apiVersion: v1
kind: Namespace
metadata:
  name: neuvector
  labels:
    app.kubernetes.io/name: neuvector
    {{- if .Values.istio.ambient.enabled }}
    istio.io/dataplane-mode: ambient
    {{- else }}
    istio-injection: enabled
    {{- end }}