Cleanup: SubdivCCG: Prevent copying of SubdivCCG

We generally do not want this struct to be copied due to its size. To
assist in finding development errors earlier, disable the copy
constructor entirely, as the destructor puts its resources into an
invalid state.

Pull Request: https://projects.blender.org/blender/blender/pulls/124439

source/blender/blenkernel/BKE_subdiv_ccg.hh

@@ -16,6 +16,7 @@
 #include "BLI_index_mask_fwd.hh"
 #include "BLI_offset_indices.hh"
 #include "BLI_sys_types.h"
+#include "BLI_utility_mixins.hh"
 #include "BLI_vector.hh"
 
 #include "BKE_ccg.hh"
@@ -85,7 +86,7 @@ struct SubdivCCGAdjacentVertex {
 };
 
 /* Representation of subdivision surface which uses CCG grids. */
-struct SubdivCCG {
+struct SubdivCCG : blender::NonCopyable {
   /* This is a subdivision surface this CCG was created for.
    *
    * TODO(sergey): Make sure the whole descriptor is valid, including all the