Support full payload validations for sidechains

[mattsse]

Describe the feature

Due to past limitations, the state root check was skipped for blocks in sidechains:

reth/crates/blockchain-tree/src/blockchain_tree.rs

Lines 130 to 141 in cd08ba8

	/// Check if the block is known to blockchain tree or database and return its status.
	///
	/// Function will check:
	/// * if block is inside database returns [BlockStatus::Valid].
	/// * if block is inside buffer returns [BlockStatus::Disconnected].
	/// * if block is part of a side chain returns [BlockStatus::Accepted].
	/// * if block is part of the canonical returns [BlockStatus::Valid].
	///
	/// Returns an error if
	/// - an error occurred while reading from the database.
	/// - the block is already finalized
	pub(crate) fn is_block_known(

This can cause attestation issues on 1-block reorgs/late blocks specifically with CL clients (lighthouse for example), because ACCEPTED is treated the same as SYNCING
because then the CL needs to wait for processed FCU and can't reuse the previous status response of the payload.

TODO

• support full state root validation for sidechains in the tree, I believe @Rjected had a PR for this at some point

Additional context

No response

[michaelsproul]

Yesss hyped for this