fix(store): slugify rdName in volume_definitions fetchRD lookup

The k8s metadata.Name for an RD is K8sName-slugified at write time,
but volume_definitions.fetchRD used the raw rdName as the lookup key.
csi-sanity creates an RD called "DeleteSnapshot-volume-1-..." (mixed
case) and then immediately POSTs volume-definitions to the same name —
the second call was 404 because the stored CRD lives under a
slugified name. Apply the same slugifier on lookup.

Co-Authored-By: Claude <noreply@anthropic.com>
Signed-off-by: Andrei Kvapil <kvapss@gmail.com>

Author: kvaps

pkg/store/k8s/volume_definitions.go

@@ -162,7 +162,7 @@ func (s *volumeDefinitions) Delete(ctx context.Context, rdName string, volumeNum
 func (s *volumeDefinitions) fetchRD(ctx context.Context, rdName string) (*crdv1alpha1.ResourceDefinition, error) {
 	var rd crdv1alpha1.ResourceDefinition
 
-	err := s.c.Get(ctx, types.NamespacedName{Name: rdName}, &rd)
+	err := s.c.Get(ctx, types.NamespacedName{Name: Name(rdName)}, &rd)
 	if err != nil {
 		if apierrors.IsNotFound(err) {
 			return nil, errors.Wrapf(store.ErrNotFound, "resource definition %q", rdName)