Single attestation "Full" implementation (#7444)

#6970


  This allows for us to receive `SingleAttestation` over gossip and process it without converting. There is still a conversion to `Attestation` as a final step in the attestation verification process, but by then the `SingleAttestation` is fully verified.

I've also fully removed the `submitPoolAttestationsV1` endpoint as its been deprecated

I've also pre-emptively deprecated supporting `Attestation` in `submitPoolAttestationsV2` endpoint. See here for more info: https://github.com/ethereum/beacon-APIs/pull/531

I tried to the minimize the diff here by only making the "required" changes. There are some unnecessary complexities with the way we manage the different attestation verification wrapper types. We could probably consolidate this to one wrapper type and refactor this even further. We could leave that to a separate PR if we feel like cleaning things up in the future.

Note that I've also updated the test harness to always submit `SingleAttestation` regardless of fork variant. I don't see a problem in that approach and it allows us to delete more code :)

beacon_node/http_api/tests/interactive_tests.rs

@@ -5,7 +5,6 @@ use beacon_chain::{
     ChainConfig,
 };
 use beacon_processor::work_reprocessing_queue::ReprocessQueueMessage;
-use either::Either;
 use eth2::types::ProduceBlockV3Response;
 use eth2::types::{DepositContractData, StateId};
 use execution_layer::{ForkchoiceState, PayloadAttributes};
@@ -539,7 +538,7 @@ pub async fn proposer_boost_re_org_test(
         slot_a,
         num_parent_votes,
     );
-    harness.process_attestations(block_a_parent_votes);
+    harness.process_attestations(block_a_parent_votes, &state_a);
 
     // Attest to block A during slot B.
     for _ in 0..parent_distance {
@@ -553,7 +552,7 @@ pub async fn proposer_boost_re_org_test(
         slot_b,
         num_empty_votes,
     );
-    harness.process_attestations(block_a_empty_votes);
+    harness.process_attestations(block_a_empty_votes, &state_a);
 
     let remaining_attesters = all_validators
         .iter()
@@ -586,7 +585,7 @@ pub async fn proposer_boost_re_org_test(
         slot_b,
         num_head_votes,
     );
-    harness.process_attestations(block_b_head_votes);
+    harness.process_attestations(block_b_head_votes, &state_b);
 
     let payload_lookahead = harness.chain.config.prepare_payload_lookahead;
     let fork_choice_lookahead = Duration::from_millis(500);
@@ -818,10 +817,10 @@ pub async fn fork_choice_before_proposal() {
         block_root_c,
         slot_c,
     );
-    harness.process_attestations(attestations_c);
+    harness.process_attestations(attestations_c, &state_c);
 
     // Apply the attestations to B, but don't re-run fork choice.
-    harness.process_attestations(attestations_b);
+    harness.process_attestations(attestations_b, &state_b);
 
     // Due to proposer boost, the head should be C during slot C.
     assert_eq!(
@@ -894,7 +893,7 @@ async fn queue_attestations_from_http() {
     let fork_name = tester.harness.spec.fork_name_at_slot::<E>(attestation_slot);
 
     // Make attestations to the block and POST them to the beacon node on a background thread.
-    let attestation_future = if fork_name.electra_enabled() {
+    let attestation_future = {
         let single_attestations = harness
             .make_single_attestations(
                 &all_validators,
@@ -907,30 +906,9 @@ async fn queue_attestations_from_http() {
             .flat_map(|attestations| attestations.into_iter().map(|(att, _subnet)| att))
             .collect::<Vec<_>>();
 
-        let attestations = Either::Right(single_attestations);
-
         tokio::spawn(async move {
             client
-                .post_beacon_pool_attestations_v2::<E>(attestations, fork_name)
-                .await
-                .expect("attestations should be processed successfully")
-        })
-    } else {
-        let attestations = harness
-            .make_unaggregated_attestations(
-                &all_validators,
-                &post_state,
-                block.0.state_root(),
-                block_root.into(),
-                attestation_slot,
-            )
-            .into_iter()
-            .flat_map(|attestations| attestations.into_iter().map(|(att, _subnet)| att))
-            .collect::<Vec<_>>();
-
-        tokio::spawn(async move {
-            client
-                .post_beacon_pool_attestations_v1(&attestations)
+                .post_beacon_pool_attestations_v2::<E>(single_attestations, fork_name)
                 .await
                 .expect("attestations should be processed successfully")
         })