WASHINGTON — The mystery woman Rep. Jimmy Gomez admitted to making “mistakes” with is his best buddy Eric Swalwell’s former chief of staff, The Post can reveal. The married California Democrat had an 11-month-old child at home when he was caught in a moment of passion with Swalwell’s minxy congressional aide Yardena Wolf three years ago. Gomez, the founder of the Dads Caucus in Congress, confessed Tuesday in a statement that he cheated on his wife after The Post’s reporting on the encounter with Wolf, which kicked off a House Ethics Committee investigation, yielding fresh tips on his conduct. Wolf,...