[BIP-533] Initiate Cooldown to Withdraw from BAL/AURA/ARB Pool on Arbitrum

PR with Payload

https://github.com/BalancerMaxis/multisig-ops/pull/741

Overview

Originally proposed and executed upon here, Balancer DAO had deposited 2M ARB along with BAL provide by the treasury, and AURA provided by Aura Finance. There was a special contract made that these LP tokens are held in that requires a 60 day cooldown period before the funds can be withdrawn. The funds are held in this contract

This pool has since incurred a significant amount of IL, and I believe it to be prudent to withdraw from this pool in order to hold onto that ARB and use it at a later date. There are discussions about leaving 25% in the pool to support bal/aura liquidity on arbitrum, but specifics will come at a later date so we can get the ball rolling to make sure we can withdraw as soon as possible.

Specifications:

The DAO multisig 0xaF23DC5983230E9eEAf93280e312e57539D098D0 will call startCooldown() on the contract at 0x8d803f7f7e26e586ee90e5a872cf7830e21f7727. Further actions will come at a later date in a separate proposal.