Federal agents have arrested the illegal immigrant who was tackled and zip-tied by onlookers  during the California wildfires in a wild scene caught on video.   Residents of Woodland Hills ran down and subdued Juan Manuel Sierra-Leyva after they saw him trying to torch debris with what one resident described as a “flamethrower” soon after last year’s massive wildfires began last January. Los Angeles Police Department officers arrested Sierra-Leyva, 34, for a felony probation violation and