By David Shepardson (Reuters) -General Motors said on Thursday it is laying off 1,300 workers at two Michigan auto factories in early January. The largest U.S. automaker said 945 workers will be laid off at its Orion Assembly plant, which is ending production of the Chevrolet Bolt EV and being converted for electric truck production that will start in late 2025. Final production of the Bolt at Orion is set for next week, GM said. Another 350 out of 1,400 total workers at its Lansing Grand River plant will be laid off due to the end of Chevrolet Camaro production, but the factory will continue …