stake-pool: add new version of DecreaseValidatorStake
to use reserve, add compatibility with master
#5322
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Note: this PR builds on #5288, starting with b482537
Problem
To adapt stake pools to the upcoming changes in solana-labs/solana#33295, stake pools need to pre-fund the rent-exempt reserve during splits in
DecreaseValidatorStake
.Solution
The first commit b482537 is the meat of the change which adds a new instruction to use the reserve, deprecates the old one. And the rest of the commits fix the tests.
I tested this with #5285 against the monorepo master, and everything passes!