It has felt like Christmas all year long for Swifties — from Taylor Swift’s “Midnights” album and its No. 1 single “Anti-Hero” to her “Eras” tour and concert film to her “Taylor’s Version” re-recordings of “Speak Now” and “1989.” But it’s the 33-year-old pop superstar’s new buzzed-about beau, Kansas City Chiefs tight end Travis Kelce,...