Fix and improve handling of empty columns after getBlobs response (#9361)

This PR fixes two issues:

1. This condition is inverted: dfb259171a/beacon_node/network/src/network_beacon_processor/gossip_methods.rs (L1507-L1508)
We are supposed to filter out incomplete columns when we DON'T have local blobs yet!
2. When the EL returns no blobs, we never store a partial in the assembler, and this code fails to publish our need to the network, as no partials are returned: dfb259171a/beacon_node/network/src/network_beacon_processor/mod.rs (L1038-L1050)


  The simple fix for 1 would be to invert the condition, but we can improve the flow here: Instead of not publishing anything, we can publish what we got, but not request anything. This ties into the fix for 2: After get blobs completes, we not only publish anything in the partial assembler, but also for every missing custody column in there, publish an empty column and a request for all cells.

In particular:
- When sending a partial message to `network`, allow specifying a request bitmap instead of hardcoding an all-ones bitmap.
- For clarity and to prepare for Gloas integration, add a `PubsubPartialMessage` enum with a `DataColumnFulu` variant.
- On republishing after merging a gossip column: always publish, but only request cells if local blobs are known or get blobs is disabled. This also prepares us to request only *some* cells, e.g. in cases where we are aware of the blobs that the EL is going to send us, e.g. via `engine_hasBlobs`.
- Move guards in `fetch_engine_blobs_and_publish` to ensure everything works fine if there are no blobs or if get_blobs is disabled.


Co-Authored-By: Daniel Knopik <daniel@dknopik.de>

beacon_node/http_api/src/publish_blocks.rs

@@ -14,7 +14,7 @@ use eth2::types::{
 };
 use execution_layer::{ProvenancedPayload, SubmitBlindedBlockResponse};
 use futures::TryFutureExt;
-use lighthouse_network::PubsubMessage;
+use lighthouse_network::{PubsubMessage, PubsubPartialMessage};
 use logging::crit;
 use network::NetworkMessage;
 use rand::prelude::SliceRandom;
@@ -442,12 +442,22 @@ pub(crate) fn publish_column_sidecars<T: BeaconChainTypes>(
     // Publish partial messages
     if !partial_columns.is_empty() {
         if let Some(header) = partial_header {
+            let header = Arc::new(header);
+            let messages = partial_columns
+                .into_iter()
+                .map(|column| {
+                    let mut request_cells = column.sidecar.cells_present_bitmap.clone();
+                    request_cells.not_inplace();
+                    PubsubPartialMessage::DataColumnFulu {
+                        column,
+                        request_cells,
+                        header: header.clone(),
+                    }
+                })
+                .collect();
             crate::utils::publish_network_message(
                 sender_clone,
-                NetworkMessage::PublishPartialColumns {
-                    columns: partial_columns,
-                    header: Arc::new(header),
-                },
+                NetworkMessage::PublishPartialColumns { messages },
             )
             .map_err(|_| {
                 BlockError::BeaconChainError(Box::new(BeaconChainError::UnableToPublish))