Consensus spec tests `v1.5.0-beta.4` fail on `unstable` when `Fulu` is enabled

[ethDreamer]

We need to fix this before peerdas-devnet-6:

running 72 tests
test derived_typenum_values ... ok
test bls_aggregate ... ok
test bls_eth_aggregate_pubkeys ... ok
test bls_sign ... ok
test bls_aggregate_verify ... ok
test bls_batch_verify ... ok
test bls_verify ... ok
test bls_fast_aggregate_verify ... ok
test bls_eth_fast_aggregate_verify ... ok
test compute_columns_for_custody_group ... ok
test epoch_processing_sync_committee_updates ... ok
test epoch_processing_participation_record_updates ... ok
test epoch_processing_historical_roots_update ... ok
test epoch_processing_slashings_reset ... ok
test epoch_processing_randao_mixes_reset ... ok
test epoch_processing_effective_balance_updates ... ok
test epoch_processing_eth1_data_reset ... ok
test fork_choice_deposit_with_reorg ... FAILED
test epoch_processing_historical_summaries_update ... ok
test epoch_processing_pending_consolidations ... ok
test fork_choice_get_proposer_head ... FAILED
test genesis_initialization ... ok
test fork_choice_should_override_forkchoice_update ... FAILED
test genesis_validity ... ok
test epoch_processing_slashings ... ok
test epoch_processing_pending_balance_deposits ... ok
test epoch_processing_participation_flag_updates ... ok
test epoch_processing_registry_updates ... ok
test kzg_compute_cells_and_proofs ... ok
test kzg_compute_kzg_proof ... ok
test kzg_blob_to_kzg_commitment ... ok
test kzg_verify_blob_kzg_proof ... ok
test kzg_compute_blob_kzg_proof ... ok
test kzg_verify_kzg_proof ... ok
test get_custody_groups ... ok
test light_client_merkle_proof_validity ... FAILED
test light_client_update ... FAILED
test epoch_processing_justification_and_finalization ... ok
test kzg_verify_cell_proof_batch ... ok
test kzg_recover_cells_and_proofs ... ok
...
test operations_execution_payload_blinded ... FAILED
test optimistic_sync ... FAILED
test transition ... FAILED

[jimmygchen]

Completed in #7559