SPRINGFIELD — A top Republican is considering a court challenge to a legislative delay tactic that was used on school-funding and abortion bills this year.Rep. Peter C. Breen, the House GOP’s floor leader in the General Assembly, said this week the maneuver that was used to keep legislation away from the governor’s desk for months — even though it had passed both chambers — violates the state constitution.That’s because the document says every bill approved by legislators “shall be …