[Derivation Pipeline] Assert batches are processed contiguously

[greged93]

Batches should be processed contiguously by the derivation pipeline. Skipping a batch should trigger an error in the pipeline, allowing to catch errors early.

[frisitano]

We check that the previous batch has been indexed in the chain orchestrator:

rollup-node/crates/chain-orchestrator/src/lib.rs

Lines 779 to 783 in 5f74b29

	// Perform a consistency check to ensure the previous commit batch exists in the
	// database.
	if tx.get_batch_by_index(prev_batch_index).await?.is_none() {
	return Err(ChainOrchestratorError::BatchCommitGap(batch.index));
	}