Fix misc PeerDAS todos (#6862)

Address misc PeerDAS TODOs that are not too big for a dedicated PR


  I'll justify each TODO on an inlined comment

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

@@ -479,8 +479,8 @@ impl<T: BeaconChainTypes> BlockLookups<T> {
                 // continue_request will send for  processing as the request state is AwaitingProcessing
             }
             Err(e) => {
-                // TODO(das): is it okay to not log the peer source of request failures? Then we
-                // should log individual requests failures in the SyncNetworkContext
+                // No need to log peer source here. When sending a DataColumnsByRoot request we log
+                // the peer and the request ID which is linked to this `id` value here.
                 debug!(self.log,
                     "Received lookup download failure";
                     "block_root" => ?block_root,