Adding istio-egress policy for future istio-injection

chart/templates/networkpolicies/istiod-egress.yml

+{{- if and .Values.networkPolicies.enabled .Values.istio.enabled }}
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: allow-istiod-egress
+  namespace: {{ .Release.Namespace }}
+spec:
+  podSelector: {}
+  policyTypes:
+  - Egress
+  egress:
+  - to:
+    - namespaceSelector:
+        matchLabels:
+          app.kubernetes.io/name: istio-controlplane
+      podSelector:
+        matchLabels:
+          app: istiod
+    ports:
+    - port: 15012
+{{- end }}
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