Single lookup improvements (#5488)

* Fix unexpected `UnrequestedBlobId` and `ExtraBlocksReturned` errors due to race conditions.

* Continue chain segment processing and skip any blocks that are already known, rather than returning an error.

* more de-dup checking

* ensure we don't reset `requested_ids` during rpc download

* better fix

* Merge branch 'unstable' of https://github.com/sigp/lighthouse into more-dup-lookup-fixes

* remove chain hash check

* Merge branch 'fix-block-lookup-race' of https://github.com/jimmygchen/lighthouse into sean-test-lookups

* remove block check

* add back tests

* Log and CI fixes

* undue extra check

* Merge branch 'sean-test-lookups' of https://github.com/realbigsean/lighthouse into sean-test-lookups

* log improvements

* Improve logging

beacon_node/beacon_chain/src/beacon_chain.rs

@@ -2796,6 +2796,12 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
                             }
                         }
                     }
+                    Err(BlockError::BlockIsAlreadyKnown(block_root)) => {
+                        debug!(self.log,
+                            "Ignoring already known blocks while processing chain segment";
+                            "block_root" => ?block_root);
+                        continue;
+                    }
                     Err(error) => {
                         return ChainSegmentResult::Failed {
                             imported_blocks,
@@ -3032,7 +3038,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
         match import_block.await {
             // The block was successfully verified and imported. Yay.
             Ok(status @ AvailabilityProcessingStatus::Imported(block_root)) => {
-                trace!(
+                debug!(
                     self.log,
                     "Beacon block imported";
                     "block_root" => ?block_root,
@@ -3045,7 +3051,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
                 Ok(status)
             }
             Ok(status @ AvailabilityProcessingStatus::MissingComponents(slot, block_root)) => {
-                trace!(
+                debug!(
                     self.log,
                     "Beacon block awaiting blobs";
                     "block_root" => ?block_root,