Defense lawyers in the Georgia election interference case against former President Donald J. Trump say they want to put someone on the stand whose testimony could back up their assertion that Terrence Bradley, a witness in their effort to disqualify the prosecutors running the case, gave misleading testimony. The new information comes from Cindi Lee Yeager, a deputy district attorney in neighboring Cobb County, Ga., whom the defense attorneys said they spoke to on Friday about conversations she had with Mr. Bradley. At issue is a key matter in the disqualification effort: the timing of the romantic relationship that developed…