[BIP-749] Grant `add_reward` Permissions to Maxis’ Omnichain Multisig

Governance General Proposal
2

Thanks for putting this together. Operationally, this will aid us a lot in bundling payloads e.g. for rewards programs more easily!

https://snapshot.box/#/s:balancer.eth/proposal/0x34f51ca0effb420ce01ee2cbfa10e4a930b4e6e8fd3b99b096ee21e0389f7fb9