Function getDecreaseValidatorStakeWithReserveInstruction

(Staker only) Decrease active stake on a validator, eventually moving it to the reserve Internally, this instruction:

• withdraws enough lamports to make the transient account rent-exempt
• splits from a validator stake account into a transient stake account
• deactivates the transient stake account In order to rebalance the pool without taking custody, the staker needs a way of reducing the stake on a stake account. This instruction splits some amount of stake, up to the total activated stake, from the canonical validator stake account, into its "transient" stake account. The instruction only succeeds if the transient stake account does not exist. The amount of lamports to move must be at least rent-exemption plus max(crate::MINIMUM_ACTIVE_STAKE, solana_program::stake::tools::get_minimum_delegation()).

0. [] Stake pool
1. [s] Stake pool staker
2. [] Stake pool withdraw authority
3. [w] Validator list
4. [w] Reserve stake account, to fund rent exempt reserve
5. [w] Canonical stake account to split from
6. [w] Transient stake account to receive split
7. [] Clock sysvar
8. '[]' Stake history sysvar
9. [] System program
10. [] Stake program