TIP-121a (cont.): Consolidation ops and technical cleanup

This proposal performs various protocol cleanup actions related to the Consolidation step of TIP-121, including:

Cleanup auction contracts

Cleans up the LUSD->DAI and WETH->DAI auction contracts that were used to sell those assets by withdrawing remaining liquidity. Sends the DAI to the DAI Holding deposit, last LUSD to the LUSD holding deposit, and deposit the last 50-100 WETH in Lido for simplicity.

Remove remaining assets from the Tribal Council Timelock

Burns the 2.7M FEI previously clawed back from the Rari Infrastructure team timelock and sends the 2.7M TRIBE also recovered to the DAO Treasury.

Oracle and PCV maintenance

Performs several collaterization oracle and PCV updates:

1. Updates the ETH oracle use a stETH/USD price feed, as remaining ETH-denominated PCV will be stETH
2. Removes deprecated and empty contracts from the oracle
3. Removes now deprecated contracts from being marked as safe deposit addresses