Upper East Side Councilwoman Julie Menin is expected to be elected the NYC Council’s speaker on Wednesday and, as a moderate Democrat, could be the city’s last line of defense against a far-leftist majority body that critics fear could turn the Big Apple into a Leninist commune. During a wide-ranging, 20-minute interview Friday with The Post’s Rich Calder, Menin, 58 — the daughter of a Holocaust survivor and a vocal Israel supporter — outlined her plan to navigate a working relationship with Socialist, pro-Palestine Mayor Zohran Mamdani and lead the Council as its first Jewish speaker. Q: As speaker, what...