Revert "Remove gcp and azure auth plugins"

This reverts commit 916cf16cf14928702f3f90b655ddddab2c85fcec.

Kubernetes-commit: 651b4f5b647a205d12fad4d0edc489d97109cccc

plugin/pkg/client/auth/azure/azure_stub.go

@@ -1,36 +0,0 @@
-/*
-Copyright 2022 The Kubernetes Authors.
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-package azure
-
-import (
-	"errors"
-
-	"k8s.io/client-go/rest"
-	"k8s.io/klog/v2"
-)
-
-func init() {
-	if err := rest.RegisterAuthProviderPlugin("azure", newAzureAuthProvider); err != nil {
-		klog.Fatalf("Failed to register azure auth plugin: %v", err)
-	}
-}
-
-func newAzureAuthProvider(_ string, _ map[string]string, _ rest.AuthProviderConfigPersister) (rest.AuthProvider, error) {
-	return nil, errors.New(`The azure auth plugin has been removed.
-Please use the https://github.com/Azure/kubelogin kubectl/client-go credential plugin instead.
-See https://kubernetes.io/docs/reference/access-authn-authz/authentication/#client-go-credential-plugins for further details`)
-}