[BIP-XXX] Deprecate Old IB/rETH Gauges & Add Gauges for the new 50/50 IB/rETH w/2% emissions cap [Optimism]

Summary:
In light of the recent upgrades and the subsequent halt of fee collection in the old IB/rETH pool(Galactic Dragon) as a mitigation measure, a new pool of IB/rETH(Galactic Dragon Act II) has been deployed using the new weighted pool factory. We propose to deprecate the existing gauge for the old IB/rETH pool and add a gauge for the new IB/rETH pool

References/Useful links:

Link to:
Original IB/rETH gauge proposal
Old IB/rETH pool(Galactic Dragon)
• Link to the new IB/rETH pool: Beethoven X | Galactic Dragon Act II
• Link to the new capped gauge: OptimismRootGauge | Address 0xb2b41b8d8371543824809227cc109178238731aa | Etherscan