FMutableTextureMipDataProvider::GetCancelThread

Returns on which thread [Cancel()](API\Plugins\CustomizableObject\MuCO\FMutableTextureMipDataProvider\Cancel) must be called in the texture update (from FTextureStreamIn) to release ressources safely and correctly. [ETickThread::None](API\Runtime\Engine\Streaming\FTextureMipDataProvider\ETickThread) when ready to delete this.