@VisibleForTesting
  boolean isBlockCreationCancelled(final PayloadIdentifier payloadId) {
    final BlockCreationTask job = blockCreationTasks.get(payloadId);
    if (job == null) {
      return true;
    }
    return job.cancelled.get();
  }
Create merge block creator for block header and fee recipient.

@param header the header
@param feeRecipient the fee recipient
@return the merge block creator
consensus/merge/src/main/java/org/hyperledger/besu/consensus/merge/blockcreation/MergeCoordinator.java