Migrate some presubmit functionality to Makefile.

api/plugins/builtins/tools.go

@@ -1,17 +0,0 @@
-// Copyright 2019 The Kubernetes Authors.
-// SPDX-License-Identifier: Apache-2.0
-
-// +build tools
-
-// This file exists to declare that its containing
-// package explicitly depends on the pluginator
-// tool (via go:generate directives)
-package builtins
-
-// TODO: replace this, with the appropriate version
-// once the API is launched, and the new pluginator
-// has been compiled against it and released.
-//
-//  import (
-//  	_ "sigs.k8s.io/kustomize/pluginator"
-// )