Clean capella (#4019)

## Issue Addressed

Cleans up all the remnants of 4844 in capella. This makes sure when 4844 is reviewed there is nothing we are missing because it got included here 

## Proposed Changes

drop a bomb on every 4844 thing 

## Additional Info

Merge process I did (locally) is as follows:
- squash merge to produce one commit
- in new branch off unstable with the squashed commit create a `git revert HEAD` commit
- merge that new branch onto 4844 with `--strategy ours`
- compare local 4844 to remote 4844 and make sure the diff is empty
- enjoy

Co-authored-by: Paul Hauner <paul@paulhauner.com>

beacon_node/network/src/sync/manager.rs

@@ -47,13 +47,13 @@ use lighthouse_network::rpc::methods::MAX_REQUEST_BLOCKS;
 use lighthouse_network::types::{NetworkGlobals, SyncState};
 use lighthouse_network::SyncInfo;
 use lighthouse_network::{PeerAction, PeerId};
-use slog::{crit, debug, error, info, trace, warn, Logger};
+use slog::{crit, debug, error, info, trace, Logger};
 use std::boxed::Box;
 use std::ops::Sub;
 use std::sync::Arc;
 use std::time::Duration;
 use tokio::sync::mpsc;
-use types::{BlobsSidecar, EthSpec, Hash256, SignedBeaconBlock, Slot};
+use types::{EthSpec, Hash256, SignedBeaconBlock, Slot};
 
 /// The number of slots ahead of us that is allowed before requesting a long-range (batch)  Sync
 /// from a peer. If a peer is within this tolerance (forwards or backwards), it is treated as a
@@ -93,14 +93,6 @@ pub enum SyncMessage<T: EthSpec> {
         seen_timestamp: Duration,
     },
 
-    /// A blob has been received from RPC.
-    RpcBlob {
-        peer_id: PeerId,
-        request_id: RequestId,
-        blob_sidecar: Option<Arc<BlobsSidecar<T>>>,
-        seen_timestamp: Duration,
-    },
-
     /// A block with an unknown parent has been received.
     UnknownBlock(PeerId, Arc<SignedBeaconBlock<T>>, Hash256),
 
@@ -592,9 +584,6 @@ impl<T: BeaconChainTypes> SyncManager<T> {
                     .block_lookups
                     .parent_chain_processed(chain_hash, result, &mut self.network),
             },
-            SyncMessage::RpcBlob { .. } => {
-                warn!(self.log, "Unexpected blob message received");
-            }
         }
     }