cmd/k8s-operator,kube/kubetypes,k8s-operator/apis: reconcile L3 HA Services (#15961)

This reconciler allows users to make applications highly available at L3 by
leveraging Tailscale Virtual Services. Many Kubernetes Service's
(irrespective of the cluster they reside in) can be mapped to a
Tailscale Virtual Service, allowing access to these Services at L3.

Updates #15895

Signed-off-by: chaosinthecrd <tom@tmlabs.co.uk>

cmd/k8s-operator/deploy/manifests/operator.yaml

@@ -4828,6 +4828,14 @@ rules:
         - get
         - list
         - watch
+    - apiGroups:
+        - discovery.k8s.io
+      resources:
+        - endpointslices
+      verbs:
+        - get
+        - list
+        - watch
     - apiGroups:
         - tailscale.com
       resources: