[CAP] Remove DAI+USDC+USDT+sUSD from the USDT Omnipool

The DAI+USDC+USDT+sUSD Curve pool on Convex currently only has $500k TVL which is an indication that there isn’t strong demand for yield farming this on Convex. It also currently has an APR of 1.33%, which is a lot lower than the other APRs in the USDT Omnipool (19.71% and 3.85%).

I propose we remove the DAI+USDC+USDT+sUSD from the USDT Omnipool to increase the APR of the Omnipool and to reduce gas costs for deposits and withdrawals.

If removed, this could always be added again with another CAP if the APR and demand for the DAI+USDC+USDT+sUSD Curve pool changes in the future.