The Giants have been something of a popular team in this feature over the last few weeks, as they have targeted and signed a number of pitchers who could have been targets for the Red Sox. They got Kevin Gausman back when he accepted the qualifying offer. They signed Anthony Desclafani for their rotation. They grabbed Matt Wisler to shore up their bullpen. And now they’ve added another reliever who could have been an intriguing, cheap add to Boston’s bullpen. That would be John Brebbia, who went to San Francisco on Monday on a one-year deal worth $800,000.