Mayoral frontrunner Zohran Mamdani on Monday blasted the “petty vindictiveness” of rival Andrew Cuomo’s proposed “Zohran’s Law” that would target privileged New Yorkers who live in rent-stabilized homes — but gave no sign he’ll move out. Mamdani, 33, who lives in a $2,300-a-month rent-stabilized Astoria apartment while pulling $142,000 a year as state assemblyman, condemned…