Illinois Supreme Court Justice Rita B. Garman announced Monday she will retire from “the role of a lifetime” on July 7 after nearly 50 years on the bench.Garman, the state’s longest-serving judge, would have been up for retention in this year’s judicial election in a seat impacted by redistricting.The announcement came midday Monday as the high court was in session.“There is no doubt that I have had the role of a lifetime, a privilege to serve the people of the state of Illinois as a member of …