Remove staking controller account logic from pallets & runtimes

[rossbulat]

This PR removes controller logic from pallets & chain specs. Tracking issue: #2500

Prerequisites before merging

This PR should be merged once the following tasks have been completed:

• restore_ledger has been executed on Polkadot, that fixes corrupt ledger state items. Polkadot Forum tracking thread here
• update_payee has been executed on Polkadot, migrating all RewardDestination::Controller entries to RewardDestination::Account(controller) entries.
• deprecate_controller_batch calls have been executed on Kusama and Polkadot, that updates all unique controllers to the corresponding stash address.

Once these prerequisites have been completed, it will be safe to bump the staking pallet with the updates of this PR.

---

Pre-merge checklist

• Update prdoc with more detailed changes.
• Re-generate staking benchmarks.
• Notify CI team of changes.

---

Controller deprecation

• Remove deprecate_controller_batch call from staking pallet and MaxControllersInDeprecationBatch across codebase.
• Remove set_controller call from staking pallet.
• Update staking calls that require controller as origin to be stash instead.
• Remove update_payee call from staking pallet.
• Remove maybe_controller param from restore_ledger.
• Tidy up testing_utils to not provide controller accounts.
• Update tests to not consider controller accounts. ddb8256
• Remove controller account associated data from mocks and chain specs. 714f2f9, ce82d98
• Update fast-unstake calls that require controller as origin to be stash instead.
• Ensure high level pallet docs no longer mention controller accounts, but mention proxies.
• Draw down usage of Bonded storage.
• Remove controller related tests (restore ledger tests).
• Remove StakingAccount::Controller from staking ledger.
• Explore migration to remove Bonded storage.

[paritytech-cicd-pr]

The CI pipeline was cancelled due to failure one of the required jobs.
Job name: test-linux-stable 1/3
Logs: https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/7207451