An Irish company that oversees travel plazas is about to expand its role in New Jersey, Gov. Phil Murphy announced Monday during his trade trip to Ireland. Applegreen, a Dublin-based company that’s the largest travel plaza operator in America, is relocating its U.S. headquarters to Glen Rock in Bergen County as it redevelops 21 highway service stations in the Garden State, Murphy said. The company is making a $126 million investment in New Jersey, while the headquarters will bring at least 100 new jobs to the state, and the service station redevelopments will add 800 jobs in the coming years, …