PhysX support

Can we still use PhysX? I still have code that requires it and i see that is still present in the unreal code base, but im getting a lot of compile erros about PhysX and the PHYSICS_INTERFACE_PHYSX=1 is no longer the case

You can still use it, however you need to get the source of UE5 and Add the PhysX addition and compile it as a custom UE5 build.