[Feature] Consolidate performance benchmark datasets (vllm-project#14036)

Signed-off-by: Jennifer Zhao <7443418+JenZhao@users.noreply.github.com>
Signed-off-by: Roger Wang <ywang@roblox.com>
Co-authored-by: Jennifer Zhao <7443418+JenZhao@users.noreply.github.com>
Co-authored-by: Roger Wang <ywang@roblox.com>

Author: 2 people