The roster of state workers raking in six-figure pay skyrocketed last year by an astonishing 12 percent to nearly 7,700 employees, according to a Herald review — a budget-busting bombshell that has fiscal watchdogs howling “enough.” The review comes as Gov. Deval Patrick is pushing for massive $1.9 billion in tax and fee hikes amid a sputtering state economy and a climbing jobless rate. The highest pay — more than $700,000 — went to those in the University of Massachusetts system. Yet, nurses, state troopers, office workers, prison guards and managers also swelled the ranks of the six-figure club, including:...