[Misc] Remove deprecated metric vllm:time_per_output_token_seconds for v0.13 release#30992

jliu9515 wants to merge 1 commit intovllm-project:mainvllm-project/vllm:mainfrom

jliu9515:cleanup/remove-deprecated-time-per-output-token-metricjliu9515/vllm:cleanup/remove-deprecated-time-per-output-token-metricCopy head branch name to clipboard