fix: make feepayer commit + undelegate work again

[thlorenz]

Problem

As part of the cloning pipeline rewrite we removed deprecated support for escrowed feepayer commit + undelegation.
It is a regression, even though no one is using this feature right now.

Solution

Add a specific instruction to the Magic Program that serves specifically to commit/undelegate escrowed fee payers.
It would take the following accounts:

payer: [signer] - the escrowed fee payer
escrow: [] - the escrow we are committing
magicprogram: []

We then check that the payer has signed the transaction and schedule a commit/undelegate for the escrow account which should be delegated.

[thlorenz]

Stale ..