Palestinian migrant from northern Africa stole a pro-Israel flag from a Long Island porch — then pummeled the homeowner who tried to stop him in a wild caught-on-video attack, officials said. Bechir Lehbeib, 26, allegedly stole the flag — which declared “In This Home We Stand with Israel — from Aleksandr Binyaminov’s porch, cops said. Binyaminov, who said one of his wife’s relatives was killed in the Oct. 7 Hamas terror attacks on Israel, was left bruised after the attack and blamed President Biden’s border policies for the clash. The homeowner told The Post he was alerted by his Ring...