[Staking] Delegators can stake but stakers can't delegate #4904
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Related: #4804.
Fixes the try state error in Westend: https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/6564522.
Passes here: https://gitlab.parity.io/parity/mirrors/polkadot-sdk/-/jobs/6580393
Context
Currently in Kusama and Polkadot, an account can do both, directly stake, and join a pool.
With the migration of pools to
DelegateStake(See #3905), the funds of pool members are locked in a different way than for direct stakers.holds.pallet-stakinguses deprecated locks (analogous to freeze) which can overlap with holds.An existing delegator can stake directly since pallet-staking only uses free balance. But once an account becomes staker, we cannot allow them to be delegator as this risks an account to use already staked (frozen) funds in pools.
When an account gets into a situation where it is participating in both pools and staking, it would no longer would be able to add any extra bond to the pool but they can still withdraw funds.
Changes