Remove `validate_header_with_total_difficulty`

[klkvr]

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Describe the feature

With total difficulty being deprecated this method is now always ignoring it https://github.com/paradigmxyz/reth/blob/ae3ffb90e4c99dd16e8bf6c5a9749c2f0cf9ec68/crates/consensus/consensus/src/lib.rs#L125-L135

https://github.com/paradigmxyz/reth/blob/ae3ffb90e4c99dd16e8bf6c5a9749c2f0cf9ec68/crates/ethereum/consensus/src/lib.rs#L208-L212

This means we can now simply perform all of those checks into validate_header

Additional context

No response