Ack/Tested-By/Reviewed-By counts on the series view
We have nice counts on the patches view (e.g. https://patchwork.freedesktop.org/project/intel-gfx/patches/) for the reviewer's tags. We could do the same for the patch list on the series view (e.g. https://patchwork.freedesktop.org/series/16856/) for improved user experience.