ATLANTA — The Knicks had finally found a solution to slowing down CJ McCollum. But for the most important defensive play of the game, they went away from it. Jalen Brunson started out guarding McCollum during the Knicks’ 109-108 Game 3 loss to the Hawks on Thursday night at State Farm Arena. But, just like the first two games of the series, McCollum toyed with him. Josh Hart was the only Knick to slow down CJ McCollum in the Knicks’ Game 3 loss, but head coach Mike Brown did not put him on McCollum in the Hawks’ final possession, and it proved costly. Charles Wenzelberg / New York Post Miles McBride and Jose Alvarado each got stints trying to slow McCollum down in the second quarter, but the results were the same. It wasn’t until the Knicks had Josh Hart guard McCollum in the second half that anything changed. McCollum was just 2-for-5 when guarded by Hart, per the league’s official tracking stats. Needing just one stop to all but secure their comeback, though, the Knicks went back to McBride.…