Enable test harness support for gloas block production & import

[jimmygchen]

Description

Enables the test harness to produce and import gloas blocks, getting check_all_blocks_from_altair_to_gloas passing. Builds on #8754.

Production changes (~75 lines)

File	Change
block_verification.rs	Simulate minimal envelope effects after state root check: set latest_block_hash from bid, cache state_root in latest_block_header.
block_verification.rs	Skip load_parent state root sanity check for gloas.
block_replayer.rs	Same envelope simulation for state replay.
execution_payload.rs	PayloadNotifier::new returns Irrelevant for gloas.
gloas.rs / produce_block.rs	BlockProductionResult returns BeaconState and Option<ExecutionPayloadEnvelope>.

Test harness / test changes (~600 lines)

• make_block and add_block_at_slot wired up for gloas block production and envelope processing.
• Tests needing pre-gloas payload/column mechanics skipped with TODO(EIP-7732) + Gloas TODO tracking issue #8590.

Additional Info

The block import path workarounds are needed because blocks are always imported before envelopes in gloas. Independent of and compatible with the envelope processing pipeline in #8806.