GKE also requires SAR endpoints

There was a specific error flow that was commented as only applying
to GKE. This was never tested specifically for GKE (only commented
as such) but that seems to be out of date and can be removed. If
the SAR endpoint does not exist it should be considered an error.

Author: johnSchnake

test/e2e/framework/auth/BUILD

@@ -8,7 +8,6 @@ go_library(
     deps = [
         "//staging/src/k8s.io/api/authorization/v1beta1:go_default_library",
         "//staging/src/k8s.io/api/rbac/v1beta1:go_default_library",
-        "//staging/src/k8s.io/apimachinery/pkg/api/errors:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/runtime/schema:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/wait:go_default_library",

test/e2e/framework/auth/helpers.go

@@ -25,7 +25,6 @@ import (
 	"github.com/pkg/errors"
 	authorizationv1beta1 "k8s.io/api/authorization/v1beta1"
 	rbacv1beta1 "k8s.io/api/rbac/v1beta1"
-	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 	"k8s.io/apimachinery/pkg/util/wait"
@@ -68,15 +67,6 @@ func WaitForNamedAuthorizationUpdate(c v1beta1authorization.SubjectAccessReviews
 
 	err := wait.Poll(policyCachePollInterval, policyCachePollTimeout, func() (bool, error) {
 		response, err := c.SubjectAccessReviews().Create(review)
-		// GKE doesn't enable the SAR endpoint.  Without this endpoint, we cannot determine if the policy engine
-		// has adjusted as expected.  In this case, simply wait one second and hope it's up to date
-		// TODO: Should have a check for the provider here but that introduces too tight of
-		// coupling with the `framework` package. See: https://github.com/kubernetes/kubernetes/issues/76726
-		if apierrors.IsNotFound(err) {
-			logf("SubjectAccessReview endpoint is missing")
-			time.Sleep(1 * time.Second)
-			return true, nil
-		}
 		if err != nil {
 			return false, err
 		}