Remove a duplicate StorageClass creation call

The issue on both tests is that before the refactor we had a method that
was creating the `StorageClass` manifest only, this manifest was used
later to be created by `TestBindingWaitForFirstConsumerMultiPVC`, after
the refactor we're ensuring that the `StorageClass` exists as a resource
before calling `TestBindingWaitForFirstConsumerMultiPVC` however this
method is still attempting to create it, that's the reason behind the
error: `resourceVersion should not be set on objects to be created

This issue wasn't caught before because
`TestBindingWaitForFirstConsumerMultiPVC` is creating the StorageClass
without the common utility function, the solution is to remove the
snippet that attempts to create the StorageClass againo

test/e2e/storage/testsuites/provisioning.go

@@ -612,14 +612,6 @@ func (t StorageClassTest) TestBindingWaitForFirstConsumerMultiPVC(claims []*v1.P
 	framework.ExpectNotEqual(len(claims), 0)
 	namespace := claims[0].Namespace
 
-	ginkgo.By("creating a storage class " + t.Class.Name)
-	class, err := t.Client.StorageV1().StorageClasses().Create(context.TODO(), t.Class, metav1.CreateOptions{})
-	framework.ExpectNoError(err)
-	defer func() {
-		err = storageutils.DeleteStorageClass(t.Client, class.Name)
-		framework.ExpectNoError(err, "While deleting storage class")
-	}()
-
 	ginkgo.By("creating claims")
 	var claimNames []string
 	var createdClaims []*v1.PersistentVolumeClaim