Ahead of the Oscars, Hollywood is torn over a blistering letter that chastised Artists4Ceasefire’s invitation for celebrities to wear its pins. Photo: Jason Armond/Los Angeles Times/Getty Images In the final lead-up to Oscars Sunday, two tiny symbols of opposition have risen in prominence — each articulating a separate ideological response to Israel’s war with Hamas in Gaza — setting the stage for a confrontation ahead of Hollywood’s splashiest awards extravaganza. On one side: the red and