The University of Massachusetts once again has the distinction of employing all but one of the state’s 50 highest-paid public workers, 2011 state records show. The two top earners are University of Massachusetts Medical School Chancellor Michael F. Collins who made $$761,314 and Terence R. Flotte, the medical school’s dean who was paid $701,141. Overall, 7,066 employees earned more than $100,000 last year. Three toll collectors earned more than $100,000 each, including one making $123,662.