feat(crypto): unlimit v2 volume encrption from validator.

ref: longhorn/longhorn 7355

Signed-off-by: James Lu <james.lu@suse.com>

webhook/resources/volume/validator.go

@@ -167,8 +167,10 @@ func (v *volumeValidator) Create(request *admission.Request, newObj runtime.Obje
 
 	// TODO: remove this check when we support the following features for SPDK volumes
 	if types.IsDataEngineV2(volume.Spec.DataEngine) {
-		if volume.Spec.Encrypted {
-			return werror.NewInvalidError("encrypted volume is not supported for data engine v2", "")
+		// if volume.Spec.Encrypted {
+		// 	return werror.NewInvalidError("encrypted volume is not supported for data engine v2", "")
+		if volume.Spec.BackingImage != "" {
+			return werror.NewInvalidError("backing image is not supported for data engine v2", "")
 		}
 		if types.IsDataFromVolume(volume.Spec.DataSource) {
 			return werror.NewInvalidError("clone is not supported for data engine v2", "")