Kate Aurthur editorSPOILER ALERT: Do not read if you have not yet watched the premiere of “Gossip Girl,” streaming now on HBO Max.Finally, it can be said: The teachers on “Gossip Girl” are Gossip Girl!Yes, in the new version of the show on HBO Max, the school’s teachers are attempting to take back their power from an entitled student body and their controlling, grade-grubbing parents.