SPRINGFIELD — Republican leaders in the legislature are on-board with a pension reform plan championed by Senate President John J. Cullerton, D-Chicago.Republican legislative leaders, Sen. Christine Radogno of Lemont and Rep. James B. Durkin, announced Thursday they want to pass Cullerton’s plan that would force workers to choose between annual pay increases or a cap on their pensionable salary as part of a bill to fund social services.GOP Gov. Bruce Rauner has said he also supports the pension idea.But just …