Sharks in City Hall are circling around NYC Schools Chancellor Kamar Samuels, insiders told The Post this week, as the first elected official has publicly called for his head. Samuels had a disastrous week after he was grilled at a City Council budget hearing Monday over The Post’s bombshell exclusive that he inked a $180,000 no-bid contract with a non-Department of Education-approved vendor Sean Kreyling in 2023, while he was superintendent of the Upper West Side’s District 3. He also split