Heather Thomson, one of the “Real Housewives” who held out on her Bravo contract till the last minute, shot her first scene for next season yesterday. “If it didn’t work out for us where it was going to benefit [us] . . . taking away from family time,” she and Carole Radziwill “could have walked away,” Thomson tells us. “When two sides want to make a deal, both sides make concessions. It was a compromise.” Does she trust Bravo? “Fool me once, shame on you. Fool me twice, shame on me. So we’ll see.”