adding missing template calls

Author: camrynl

.pipelines/singletenancy/cilium-overlay/cilium-overlay-e2e-step-template.yaml

@@ -248,13 +248,5 @@ steps:
       fi
     name: "testAsyncDelete"
     displayName: "Verify Async Delete when CNS is down"
-  
-  - script: |
-      echo "Deploy nginx pods for MTU testing"
-      kubectl apply -f hack/manifests/nginx.yaml
-      kubectl wait --for=condition=available --timeout=60s -n kube-system deployment/nginx
-      cd hack/scripts
-      chmod +x cilium-mtu-validation.sh
-      ./cilium-mtu-validation.sh
-    name: "CiliumMTUValidation"
-    displayName: "Run Cilium MTU Validation"
+
+  - template: ../../templates/cilium-mtu-check.yaml

.pipelines/singletenancy/cilium-overlay/cilium-overlay-e2e.steps.yaml

@@ -247,4 +247,5 @@ steps:
     name: "testAsyncDelete"
     displayName: "Verify Async Delete when CNS is down"
   
+  - template: ../../templates/cilium-mtu-check.yaml