add consistency check on startup

[mattsse]

we're checking pipeline consistency on startup:

reth/crates/consensus/beacon/src/engine/mod.rs

Lines 577 to 588 in a82b3c5

	/// Check if the pipeline is consistent (all stages have the checkpoint block numbers no less
	/// than the checkpoint of the first stage).
	///
	/// This will return the pipeline target if:
	/// * the pipeline was interrupted during its previous run
	/// * a new stage was added
	/// * stage data was dropped manually through `reth stage drop ...`
	///
	/// # Returns
	///
	/// A target block hash if the pipeline is inconsistent, otherwise `None`.
	fn check_pipeline_consistency(&self) -> RethResult<Option<B256>> {

we need to do the same when we launch the chain orchestrator

reth/crates/ethereum/node/src/launch.rs

Lines 240 to 243 in a82b3c5

	if let Some(initial_target) = initial_target {
	debug!(target: "reth::cli", %initial_target, "start backfill sync");
	eth_service.orchestrator_mut().start_backfill_sync(initial_target);
	}