[Companion] Allow StakingAdmin to set min_commission (#6444)

* rename staking origin

* fix comments

* rename origin

* give fake weight before re-benchmarking

* ".git/.scripts/bench-bot.sh" runtime westend-dev pallet_staking

* ".git/.scripts/bench-bot.sh" runtime polkadot-dev pallet_staking

* ".git/.scripts/bench-bot.sh" runtime kusama-dev pallet_staking

* update lockfile for {"substrate"}

Co-authored-by: parity-processbot <>