By Lizzy Becherano The LA Galaxy are through to the MLS Western Conference semifinals after defeating Nashville SC 1-0 at Dignity Health Sports Park on Saturday. Right-back Julian Araujo scored the lone goal, heading home a cross by Samuel Grandsir in the 60th minute to seal the victory. “[Scoring the goal is] everything to me. My whole life I’ve been working for opportunities and moments like these,” Araujo told MLSsoccer.com’s Susannah Collins. “To be able to be in a position to win a trophy and to help contribute to the team, it was a team effort. We all played 100 percent to the final whis…