[BIP-97] Enable IB/rETH 50/50 Gauge w/2% emissions cap[Optimism]

[zekraken]

@Ceazor7

Wouldnt the cap be determined by the votes that are directed to the gauge? Why should there be a hard coded cap on this. If veBAL holders want to vote to direct their power there, they should be able to.

see the vote here Snapshot where the community decided to implement a cap system. there is a very lengthy discussion as to the why here [BIP-57] Introduce Gauge Framework v1