e2e: retry deleting Rook artifacts in case of error

On occasion deploying CephFS components fail due to errors like these:

    failed to delete provisioner rbac .../csi-provisioner-rbac.yaml

By using the deleteResource() helper, an retry is done in case of a
failure.

Signed-off-by: Niels de Vos <ndevos@redhat.com>

e2e/cephfs_helper.go

@@ -105,6 +105,7 @@ func createCephfsStorageClass(
 	sc.Namespace = cephCSINamespace
 
 	timeout := time.Duration(deployTimeout) * time.Minute
+
 	return wait.PollImmediate(poll, timeout, func() (bool, error) {
 		_, err = c.StorageV1().StorageClasses().Create(context.TODO(), &sc, metav1.CreateOptions{})
 		if err != nil {