BOX SCORELOS ANGELES — In the fifth inning Friday night, about two hours after the first pitch, Dodger Stadium started shaking. But it had nothing to do with the game being Clayton Kershaw’s final regular season start in Los Angeles. Shortly after Kershaw departed, Shohei Ohtani and Mookie Betts went back-to-back off Giants starter Robbie Ray. That flipped a close game and led to another NL West loss for the Giants, who are getting closer and closer to being officially eliminated from the MLB postseason race. The 6-3 loss was the fourth in five games on this road trip through Phoenix and Los Angeles and sixth in seven games since the Giants briefly climbed into a tie for a postseason spot. They got a leadoff homer from Heliot Ramos, but after that it was another quiet night for a group that has seen its stars slump with the season on the line. The night started with a standing ovation for Kershaw, who took the field alone and then signaled his teammates to join him as he warmed up. Before many of the 53,000 could sit down, Ramos blasted a 431-foot homer to left-center, but the Giants weren’t able to spoil Kershaw’s big night.  Heliot...