Improve benchmark role, refs #32350

doc/bench.md

playbooks/bench-server.yml

playbooks/bench-worker.yml

playbooks/bench.yml

roles/bench-server/defaults/main.yml

roles/bench-server/meta/main.yml

roles/bench-server/tasks/main.yml

roles/bench-worker/defaults/main.yml

roles/bench-worker/meta/main.yml

roles/bench-worker/tasks/main.yml