align auth provider with go-client

[tg123]

azure and gcp provider was removed in go-client,
as a result, remove those code to align with go-client to avoid confusing

https://github.com/kubernetes/client-go/blob/6b97f71afcff4f2d6560c79e9e304cc31a8b4ef7/plugin/pkg/client/auth/azure/azure_stub.go#L32

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`)
}

https://github.com/kubernetes/client-go/blob/6b97f71afcff4f2d6560c79e9e304cc31a8b4ef7/plugin/pkg/client/auth/gcp/gcp_stub.go#L32

func newGCPAuthProvider(_ string, _ map[string]string, _ rest.AuthProviderConfigPersister) (rest.AuthProvider, error) {
	return nil, errors.New(`The gcp auth plugin has been removed.
Please use the "gke-gcloud-auth-plugin" kubectl/client-go credential plugin instead.
See https://cloud.google.com/blog/products/containers-kubernetes/kubectl-auth-changes-in-gke for further details`)
}

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[brendandburns]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: brendandburns, tg123

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