[conache]

Issue Addressed

Several tests fail when run with FORK_NAME=heze, because their setup and test utilities don't support Heze yet.
This PR complements #10263 and #10266 (both part of the FOCIL implementation), which fix the remaining failures.
With all three, all tests should pass with FORK_NAME=heze.

Note that this PR doesn't depend on the mentioned PRs and can be merged independently.

Proposed Changes

• Disable Heze in the Fulu and Gloas fork transition tests
• Read target_gas_limit() in the gas limit tests, so they accept Heze's V5 attributes
• The mock EL now uses the correct block hash for Heze payloads

Additional Info

• On unstable, 56 tests fail with FORK_NAME=heze. This PR fixes 11 of them
• The remaining 45 are the bid verification tests (fixed in Add gossip IL bits inclusivity check for execution payload bids #10263) and the builder-only block production test (fixed in Add inclusion list bits handling to block production #10266)
• The existing suites for fulu and gloas still pass

To run the affected suites:

make test-beacon-chain-heze test-http-api-heze test-network-heze

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