Perf (and AB-perf) consolidation

[maxtropets]

• Refactor AB-bench to be up-to-date with main
• Change main + AB style
  • Plots bigger
  • Left->right instead of top->down

[achamayou]

The text on the charts is now very small, and cannot be read at all if they are not expanded. The single column layout only uses a very small amount of horizontal space.
With the table of links gone, clicking through to the commit that caused the regression is no longer possible. It would be nicer to do on the plot directly of course, but I did not find a way to do that with mermaid.

[maxtropets]

Context: this's almost all moved from perf_summary for reuse by AB, except swapping plots axis