Gloas local block building cleanup (#8834)

Continuation of #8754, some small cleanups and address TODOs


  


Co-Authored-By: Jimmy Chen <jchen.tc@gmail.com>

beacon_node/beacon_chain/src/data_column_verification.rs

@@ -496,7 +496,6 @@ where
     Ok(())
 }
 
-// TODO(gloas) make sure the gloas variant uses the same span name
 #[instrument(
     skip_all,
     name = "validate_data_column_sidecar_for_gossip",