OPRUN-3895: Namespace wide default deny for ingress/egress

Author: anik120

config/base/common/kustomization.yaml

@@ -2,3 +2,4 @@ apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 resources:
 - namespace.yaml
+- network_policy.yaml

config/base/common/network_policy.yaml

@@ -0,0 +1,10 @@
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: default-deny-all-traffic
+  namespace: system
+spec:
+  podSelector: { }
+  policyTypes:
+    - Ingress
+    - Egress