perf: Optimize strip_trailing_slash with O(1) index check#19679

AlexsanderHamir merged 2 commits intoBerriAI:mainBerriAI/litellm:mainfrom

ryan-crabbe:perf/optimize-strip-trailing-slashryan-crabbe/litellm:perf/optimize-strip-trailing-slashCopy head branch name to clipboard