Deprecate/Remove v1 block publishing

With Deneb inclusion of [/eth/v2/beacon/blocks](https://ethereum.github.io/beacon-APIs/#/Beacon/publishBlockV2) and [/eth/v2/beacon/blinded_blocks](https://ethereum.github.io/beacon-APIs/#/Beacon/publishBlindedBlockV2), V1 is now deprecated in Electra and the Fulu fork can remove v1 block publishing. 

Reference: https://github.com/ethereum/beacon-APIs/pull/467#event-14207965330