#jira UE-122078
#rb Andrew.Davidson, Colin.McGinley
#preflight standard build
#ROBOMERGE-AUTHOR: fred.kimberley
#ROBOMERGE-SOURCE: CL 18817999 in //UE5/Release-5.0/... via CL 18818012 via CL 18822871
#ROBOMERGE-BOT: UE5 (Release-Engine-Test -> Main) (v910-18824042)
[CL 18824721 by fred kimberley in ue5-main branch]
Also remove unnecessary allocations by allowing the async task to assume ownership of the vertex and index arrays passed to it.
#rb Andy.Davidson, Cedric.Caillaud
#jira UE-125187
[CL 17448234 by Richard TalbotWatkin in ue5-main branch]