The Jackson Health System announced Wednesday something that has eluded Miami-Dade County government for months: It reached a tentative deal with labor unions. The public hospital network and two unions that represent more than 10,000 workers announced agreements to phase out an unpopular pay concession and award employees one-time bonuses. Jackson would reduce the pay contribution, which goes toward group healthcare costs, to 2 percent from 5 percent, retroactive to Jan. 1. The remaining 2 percent would go away at the end of the fiscal year on Sept. 30.