This change addresses the errors found with applying certain modeling tools to skeletal meshes due to the old code not using the appropriately setup MeshDescription for skeletal meshes.
#rb Ryan.Schmidt
#rnx
#jira UE-138420
#preflight 61d8dbc4430de36baa5fd904
#ROBOMERGE-AUTHOR: nathan.mitchell
#ROBOMERGE-SOURCE: CL 18588220 in //UE5/Release-5.0/... via CL 18588227 via CL 18588243
#ROBOMERGE-BOT: STARSHIP (Release-Engine-Test -> Main) (v899-18417669)
[CL 18588249 by nathan mitchell in ue5-main branch]