Olivia Rodrigo mocked her former Disney Channel co-star Jake Paul during her hosting gig on “Saturday Night Live.” The pop star pulled double duty as musical guest and host on the variety show over the weekend where she couldn’t help but poke fun of Paul, who was her castmate on the comedy series “Bizaardvark.” The show made them both famous and Rodrigo reflected on how far they’ve come in her opening monologue — she just dropped her third studio album, “you seem pretty sad for a girl so in love,” and he has carved out a YouTube and boxing career for himself. Olivia Rodrigo mocked her former Disney Channel co-star Jake Paul during her hosting gig on “Saturday Night Live.” NBC “When I was 13, I was on a Disney show called ‘Bizaardvark,’ and we had an incredible cast, which included acting legend Jake Paul,” 23-year-old Rodrigo began.…