Plus, three acts score their first top five hits: Tommy Richman, new at No. 2, Shaboozey (27-3) and Sabrina Carpenter (22-4). Taylor Swift’s “Fortnight,” featuring Post Malone, notches a second week at No. 1 on the Billboard Hot 100 songs chart (fittingly given its title). A week earlier, Swift made history by infusing the Hot 100’s top 14 positions, all …