Format C++ checkout benchmark

Workflow runs for Format C++ checkout benchmark

• tools: separate before and after benchmark matrices

  completed successfully:
  Format C++ checkout benchmark#4:Commit63d1896pushedbyinoway46
  format-cpp-checkout-benchmark

  Oct 3, 20261h 30m 45s
  More actions for workflow run 4

• tools: run 128 format-cpp checkout trials per variant

  cancelled:
  Format C++ checkout benchmark#3:Commitd563ca3pushedbyinoway46
  format-cpp-checkout-benchmark

  Oct 3, 20269m 22s
  More actions for workflow run 3

• tools: normalize benchmark diff object names

  completed successfully:
  Format C++ checkout benchmark#2:Commitb393e04pushedbyinoway46
  format-cpp-checkout-benchmark

  Oct 3, 20266m 21s
  More actions for workflow run 2

• tools: benchmark format-cpp checkout history

  failed:
  Format C++ checkout benchmark#1:Commitf3145a4pushedbyinoway46
  format-cpp-checkout-benchmark

  Oct 3, 20265m 47s
  More actions for workflow run 1