TOKYO—Simone Biles was left weighing her Olympic future on Tuesday after dropping out of the women’s gymnastics team final at the Tokyo Summer Games after one disappointing vault saying she had to focus on her mental health. For so long Biles had appeared invincible, racking up 30 world and Olympic medals in a spectacular career that was expected to come to a closely-watched climax in Tokyo as she launched a bid for six gold medals that would make her the greatest female Olympic champion of all time. But just as her quest got underway on Tuesday it all unravelled, the 24-year-old American later conceding that the pressure of living up to expectations had left her no other choice but to stop after one vault. The retirement from the team competition has left Biles’ future participation at the Tokyo Games in limbo. She had been expected to feature in all six …