Upgrade Polygon zkEVM unipool contract to enable manual "unlock" via multisig tx

[laurenluz]

We plan to phase-out the Polygon zkEVM GIV staking incentives when this period of GIVpower rewards expires June 10, 2025.

Currently, we have users locking their GIV, for periods up to 1 year on zkEVM
Since we do not plan to continue incentives there indefinitely, we should consider upgrading the unipool contract to allow the DAO to manually "unlock tokens".

I think the admin giv.eth should be able to do this.

Curious what it would take - how much time and whose? - and what the possible risks would be to upgrading the contract to enable this. I think doing it just on zkEVM should be enough, and we can leave Gnosis and Optimism alone to start.

@aminlatifi can you do a bit of research and let me know what this would take by comment on this issue?