Kintsugi review comments (#2831)

* Fix makefile

* Return on invalid finalized block

* Fix todo in gossip scoring

* Require --merge for --fee-recipient

* Bump eth2_serde_utils

* Change schema versions

* Swap hash/uint256 test_random impls

* Use default for ExecutionPayload::empty

* Check for DBs before removing

* Remove kintsugi docker image

* Fix CLI default value

beacon_node/network/src/beacon_processor/worker/gossip_methods.rs

@@ -747,9 +747,7 @@ impl<T: BeaconChainTypes> Worker<T> {
                 self.propagate_validation_result(message_id, peer_id, MessageAcceptance::Ignore);
                 return None;
             }
-            // TODO: check that this is what we're supposed to do when we don't want to
-            //       penalize a peer for our configuration issue
-            // in the verification process BUT is this the proper way to handle it?
+            // TODO(merge): reconsider peer scoring for this event.
             Err(e @BlockError::ExecutionPayloadError(ExecutionPayloadError::RequestFailed(_)))
             | Err(e @BlockError::ExecutionPayloadError(ExecutionPayloadError::NoExecutionConnection)) => {
                 debug!(self.log, "Could not verify block for gossip, ignoring the block";