EIP-8015 Remove `deposit` and `eth1data` fields

DraftCorecreated 2025-08-22requires EIP-6110, EIP-7688, EIP-7773

Remove legacy deposit and Eth1 data fields from `BeaconBlockBody` and `BeaconState` after EIP-6110 finalization

Authors: Terence (@terencechain), Etan Kissling (@etan-status)

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What the specification covers

This proposal declares no Solidity interface, so there is nothing to compute. It may be a core protocol change, a meta proposal, or written in prose only.

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