kube,cmd/{k8s-operator,containerboot},envknob,ipn/store/kubestore,*/depaware.txt: split out kube types (#13417)

Further split kube package into kube/{client,api,types}. This is so that
consumers who only need constants/static types don't have to import
the client and api bits.

Updates#cleanup

Signed-off-by: Irbe Krumina <irbe@tailscale.com>

cmd/k8s-operator/ingress.go

@@ -23,7 +23,7 @@ import (
 	"sigs.k8s.io/controller-runtime/pkg/client"
 	"sigs.k8s.io/controller-runtime/pkg/reconcile"
 	"tailscale.com/ipn"
-	"tailscale.com/kube"
+	kubetypes "tailscale.com/kube/types"
 	"tailscale.com/types/opt"
 	"tailscale.com/util/clientmetric"
 	"tailscale.com/util/set"
@@ -54,7 +54,7 @@ type IngressReconciler struct {
 var (
 	// gaugeIngressResources tracks the number of ingress resources that we're
 	// currently managing.
-	gaugeIngressResources = clientmetric.NewGauge(kube.MetricIngressResourceCount)
+	gaugeIngressResources = clientmetric.NewGauge(kubetypes.MetricIngressResourceCount)
 )
 
 func (a *IngressReconciler) Reconcile(ctx context.Context, req reconcile.Request) (_ reconcile.Result, err error) {