Add OPA examples on pathType restrictions (#9992)

docs/examples/openpolicyagent/tests/should-allow-ns-except.yaml

@@ -0,0 +1,18 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  creationTimestamp: null
+  name: simple
+  namespace: privileged
+spec:
+  rules:
+  - host: foo1.com
+    http:
+      paths:
+      - backend:
+          service:
+            name: svc1
+            port:
+              number: 8080
+        path: /bar
+        pathType: ImplementationSpecific

docs/examples/openpolicyagent/tests/should-allow.yaml

@@ -0,0 +1,17 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  creationTimestamp: null
+  name: simple
+spec:
+  rules:
+  - host: foo.com
+    http:
+      paths:
+      - backend:
+          service:
+            name: svc1
+            port:
+              number: 8080
+        path: /bar
+        pathType: Exact

docs/examples/openpolicyagent/tests/should-deny.yaml

@@ -0,0 +1,17 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  creationTimestamp: null
+  name: simple
+spec:
+  rules:
+  - host: foo2.com
+    http:
+      paths:
+      - backend:
+          service:
+            name: svc1
+            port:
+              number: 8080
+        path: /bar
+        pathType: ImplementationSpecific