feat(jovian/block-validation): fix block validation for jovian

[theochap]

Description

In Jovian, the blob_gas_used field has been repurposed to hold the DA footprint block limit value computed during block execution. We should change consensus rules to diverge from the L1 behavior from Jovian onwards.

Added tests to increment coverage on this behavior.

[mattsse]

this makes sense to me

pending @klkvr @emhane

[mattsse]

this else if looks correct to me

because this does

reth/crates/consensus/common/src/validation.rs

Lines 80 to 92 in 159ff01

	pub fn validate_cancun_gas<B: Block>(block: &SealedBlock<B>) -> Result<(), ConsensusError> {
	// Check that the blob gas used in the header matches the sum of the blob gas used by each
	// blob tx
	let header_blob_gas_used = block.blob_gas_used().ok_or(ConsensusError::BlobGasUsedMissing)?;
	let total_blob_gas = block.body().blob_gas_used();
	if total_blob_gas != header_blob_gas_used {
	return Err(ConsensusError::BlobGasUsedDiff(GotExpected {
	got: header_blob_gas_used,
	expected: total_blob_gas,
	}));
	}
	Ok(())
	}

[emhane]

lgtm. will open debt issue to move that blob gas used check into a new jovian model, not a prio now though in order to unblock.