more logging improvements (#4885)

## Issue Addressed

-downgrades `Missing components over rpc` to debug because this isn't unusual and just results in a re-try
-removes the result from  `Block component processed for lookup` because this prints the full block on an unknown parent error

Co-authored-by: realbigsean <seananderson33@gmail.com>

beacon_node/network/src/sync/block_lookups/mod.rs

@@ -786,7 +786,7 @@ impl<T: BeaconChainTypes> BlockLookups<T> {
             self.log,
             "Block component processed for lookup";
             "response_type" => ?R::response_type(),
-            "result" => ?result,
+            "block_root" => ?root,
         );
 
         match result {