(KTLA) — Students and staff at Los Osos High School in Rancho Cucamonga are grieving the loss of varsity dance team captain Emily Gold. Gold, 17, took her own life Friday night, just months after she appeared on “America’s Got Talent” with her team. Friends and loved ones described her as beautiful, kind, loving and a leader. The high school senior was also a member of the varsity cheer squad. In one of her final Instagram posts, Gold wrote that performing on “AGT” was “the most incredible experience.” She also thanked her high school team for being the best family…