The elite private school affiliated with the UN that caught eighth-grade students scrawling swastikas and other hate imagery into yearbooks last week has kicked out a handful of the offenders, The Post has learned. The United Nations International School sent an email to all parents on Thursday after it concluded its “thorough and deliberate” investigation into the “yearbook incident” that it had said affected more than 30 yearbooks and potentially involved as many as 15 kids. “All students