Add monitoring tag to e2e test template

Author: willie-yao

templates/test/ci/cluster-template-prow-ci-version-dual-stack.yaml

@@ -0,0 +1,11 @@
+---
+apiVersion: infrastructure.cluster.x-k8s.io/v1beta1
+kind: AzureMachineTemplate
+metadata:
+  name: ${CLUSTER_NAME}-md-0
+  namespace: default
+spec:
+  template:
+    spec:
+      additionalTags:
+        monitoring: virtualmachine

templates/test/ci/cluster-template-prow-ci-version-ipv6.yaml

@@ -42,6 +42,7 @@ patches:
 - path: ../patches/windows-machine-deployment-replicas.yaml
 - path: ../../../azure-cluster-identity/azurecluster-identity-ref.yaml
 - path: ../patches/azuremachinetemplate-vmextension.yaml
+- path: ../patches/azuremachinetemplate-monitoring.yaml
 - path: ../patches/windows-feature-gates.yaml
 - path: ../patches/windows-containerd-labels.yaml
 - path: ../patches/windows-server-version.yaml