Don't reconcile all pods whenever a service change

[lahabana]

Description

Related to:

• perf(k8s): omit fetching other dataplanes when vips are in the config map #6940

Now that dataplanes don't contain outbounds we shouldn't need to update all pods when a service changes:

kuma/pkg/plugins/runtime/k8s/controllers/pod_controller.go

Lines 382 to 400 in f62c629

	func ServiceToPodsMapper(l logr.Logger, client kube_client.Client) kube_handler.MapFunc {
	l = l.WithName("service-to-pods-mapper")
	return func(ctx context.Context, obj kube_client.Object) []kube_reconile.Request {
	// List Pods in the same namespace as a Service
	pods := &kube_core.PodList{}
	if err := client.List(ctx, pods, kube_client.InNamespace(obj.GetNamespace())); err != nil {
	l.WithValues("service", obj.GetName()).Error(err, "failed to fetch Pods")
	return nil
	}
	var req []kube_reconile.Request
	for _, pod := range pods.Items {
	req = append(req, kube_reconile.Request{
	NamespacedName: kube_types.NamespacedName{Namespace: pod.Namespace, Name: pod.Name},
	})
	}
	return req
	}
	}

I think we only need to reconcile pods that this service matches not all pods of the namespace

I also don't think we need to reconcile pods on external service:

kuma/pkg/plugins/runtime/k8s/controllers/pod_controller.go

Line 377 in f62c629

Watches(&mesh_k8s.ExternalService{}, kube_handler.EnqueueRequestsFromMapFunc(ExternalServiceToPodsMapper(r.Log, mgr.GetClient()))).