Cynthia Littleton Business EditorSarah Jessica Parker got a big career boost as a teenager from her starring role in the offbeat, much-praised sitcom “Square Pegs,” which had a one-and-done, brilliant-but-canceled run on CBS in the 1982-83 season.Parker has paid tribute to “Square Pegs” creator and showrunner Anne Beatts, who died April 7 at the age of 74.