Longtime devotees of San Diego Opera may reminisce about the Tito Capobianco era, when the most celebrated opera stars—Beverly Sills, Tatiana Troyanos, and Luciano Pavarotti—performed with the local company at Civic Theatre. Capobianco may be a fading memory, and New York City Opera expired last year, but San Diego Opera’s upcoming production of Verdi’s “A Masked Ball” featuring Polish tenor Piotr Beczala and American mezzo-soprano Stephanie Blythe in major roles promises a return of the star-studded cast . . .