Chaos Cloth - Visualization materials cause async load flush and slows down starting a PIE session.

The loading of the cloth visualization materials disturbs async loads shortly after starting PIE which causes an async flush and several seconds stall.

The solution would be to move these to a singleton that is only triggering the load when the materials are actually needed.

See:

https://forums.unrealengine.com/t/chaos-cloth-visualization-doing-blocking-loads-that-cause-async-flush-when-starting-our-pie-sessions-on-ue5-3/1958167