Ketel Marte’s walk-off homer, which gave the Arizona Diamondbacks a split of their home series with the Los Angeles Dodgers in early June, was one of the most dramatic moments of the Diamondbacks’ season, and perfectly encapsulated why team officials refuse to give up on him. (Instagram via dbacks) By KEN ROSENTHAL / THE ATHLETIC Ketel Marte turned toward the Arizona Diamondbacks’ dugout, flipped his bat and shook his head with the tiniest of smiles, as if to say, “Don’t mess with me.” The…