Check gas limit consistency with the target

[zilm13]

PR Description

Implementation of ethereum/consensus-specs#5236
Part of alpha.8 spec #10724

Fixed Issue(s)

Documentation

• I thought about documentation and added the doc-change-required label to this PR if updates are required.

Changelog

• I thought about adding a changelog entry, and added one if I deemed necessary.

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Note

Medium Risk
Changes Gloas gossip validation and SSZ field naming for proposer preferences, affecting which builder bids are accepted; fork upgrade bid initialization is also adjusted.

Overview
Aligns Gloas proposer preferences with consensus-spec alpha.8 by renaming the SSZ field from gas_limit to target_gas_limit and threading that name through creation, publishing, and payload-attribute selection.

Execution payload bid gossip no longer rejects bids whose gas_limit differs from preferences by exact equality. It now ignores bids unless gas_limit is compatible with target_gas_limit under the EIP-1559 ±1/1024 rule from the parent execution payload’s gas limit, deferring validation when the parent limit is unknown. GossipValidationHelper exposes parent gas limit lookup from the store.

Gloas fork upgrade seeds latest_execution_payload_bid with the pre-fork latest payload gas limit instead of zero. Reference tests temporarily skip the Gloas fork directory until alpha.8 vectors land.

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[StefanBratanov]

LGTM

[StefanBratanov]

LGTM