When the Goo Goo Dolls single “Iris” was released on April 1, 1998, following its inclusion on the soundtrack of the 1998 film “City of Angels,” no one had any idea what started as an add-on cut for the film would wind up becoming one of the best-selling singles of all time. Nearly three decades later, this ubiquitous ‘90s power ballad has experienced a modern-day rebirth and will be on full display when the band hits the stage at Jones Beach on Saturday, Aug. 2. The song’s current popularity was spurred by a number of circumstances. In addition to