Staking::{bond, set_controller} to set controllers to stash only. (#14039)

* update set_controller

* clone

* bond uses `stash`

* remove controller from bond(), chill_other test works

* remove ctlr from testing_utils &  dead ctlr -> dead payee

* mvs controllers to stashes for 3 tests

* migrate mock bond fns & fix 1 test

* mvs controllers to stashes for 7 tests

* mvs controllers to stashes for 9 tests

* remove double_controlling_should_fail

* remove double_staking_should_fail

* mvs controllers to stashes for 10 tests

* mvs controllers to stashes for 2 tests

* remove payout_creates_controller

* mvs controllers to stashes for 27 tests

* remove println!

* fix rewards_should_work

* fix test_payout_stakers

* fix bond benchmark

* clone

* rm unused import

* rm unused var

* rm controller from create_offender

* fix GenesisConfig stakers

* fix controllers in consensus pallets

* fix unqiue controller in chain_spec

* fmt

* fix create_offender

* fix set_controller benchmark

* add TODO

* create_unique_stash_controller

* staking benchmarks working

* fmt

* fix args

* rm println

* import

* import

* fix fast unstake tests

* fix staking-tests-e2e

* fix root-offenses

* fmt

* differentiate controller to stash

* bring back change_controller_works w. unique ctrl

* bring back double_staking_should_fail

* double_controlling_attempt_should_fail

* bring back payout_creates_controller

* add commnet to controller balances

* + set_controller call description

* fmt

* rm clones

* fmt

* clippy fixes

* fmt

* update README

* small fixes

* use controller_to_be_deprecated

* .comment

* comment

* bump zombienet version

* ci

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Co-authored-by: parity-processbot <>
Co-authored-by: Javier Viola <javier@parity.io>