[COMPOUND] Update Price Feeds on Arbitrum for LSTs

Proposal summary

WOOF team suggests to update price feeds for LSTs on Arbitrum markets:

-	wstETH on WETH Arbitrum market from market rate to exchange rate
-	weETH on WETH Arbitrum market from market rate to exchange rate
-	wstETH on USDT Arbitrum market from market rate to exchange rate
-	wstETH on USDC Arbitrum market from market rate to exchange rate

Simulations have confirmed the market’s readiness, as much as possible, using the Comet scenario suite. Further detailed information can be found on the corresponding proposal pull request.

Proposal Actions

The proposal contains only 1 action on Mainnet - send message to arbitrum. There are 7 actions on the Arbitrum side: four first ones are update price feeds and three last actions make comet update to new version.

https://compound.finance/governance/proposals/300