[GIP-271] Final steps to sunset V3.0 markets on Arbitrum, Optimism and Sonic. Accelerate migration on Ethereum

# Author desnake ------------------------------------------------------------------------ # Summary This proposal outlines the next steps in transitioning away from the older Gearbox v3.0 markets on Arbitrum, Optimism, and Sonic. As well as completing the additional deprecation steps on Ethereum mainnet: forbid creation of new exposure, set IRMs to those were used before softer curves were introduced in...