PHILADELPHIA — Pennsylvania Gov. Josh Shapiro appeared in Philadelphia Friday to sign two bills that focus on reforming the state’s probation system and Clean Slate Laws. Philadelphia native and rapper Meek Mill appeared with Shapiro at the National Constitution Center to discuss the legislation, which the governor called a “commonsense step to remove unnecessary barriers for Pennsylvanians who want to rebuild their lives.” “More parents will get the jobs they wanted. More people will get back up on their feet,” Shapiro said. Here is what you need to know: —What does Senate Bill 838 do? Introd…