Add /eth/v2/validator/aggregate_attestation (#14481)

* add endpoint

* changelog

* fix tests

* fix endpoint

* remove useless broken code

* review + fix endpoint

* gaz

* fix aggregate selection proof test

* fixes

* new way of aggregating

* nit

* fix part of the tests

* fix tests

* cleanup

* fix AggSelectionProof test

* tests

* v1 tests

* v2 tests

* commiittee bits

---------

Co-authored-by: rkapka <radoslaw.kapka@gmail.com>
Co-authored-by: Radosław Kapka <rkapka@wp.pl>

validator/client/beacon-api/submit_aggregate_selection_proof.go

@@ -2,6 +2,7 @@ package beacon_api
 
 import (
 	"context"
+	"encoding/json"
 	"net/url"
 	"strconv"
 
@@ -52,7 +53,12 @@ func (c *beaconApiValidatorClient) submitAggregateSelectionProof(
 		return nil, err
 	}
 
-	aggregatedAttestation, err := convertAttestationToProto(aggregateAttestationResponse.Data)
+	var attData *structs.Attestation
+	if err := json.Unmarshal(aggregateAttestationResponse.Data, &attData); err != nil {
+		return nil, errors.Wrap(err, "failed to unmarshal aggregate attestation data")
+	}
+
+	aggregatedAttestation, err := convertAttestationToProto(attData)
 	if err != nil {
 		return nil, errors.Wrap(err, "failed to convert aggregate attestation json to proto")
 	}

validator/client/beacon-api/submit_aggregate_selection_proof_test.go

@@ -2,6 +2,7 @@ package beacon_api
 
 import (
 	"context"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"testing"
@@ -124,6 +125,9 @@ func TestSubmitAggregateSelectionProof(t *testing.T) {
 				test.attestationDataErr,
 			).Times(test.attestationDataCalled)
 
+			attestationJSON, err := json.Marshal(jsonifyAttestation(aggregateAttestation))
+			require.NoError(t, err)
+
 			// Call attestation data to get attestation data root to query aggregate attestation.
 			jsonRestHandler.EXPECT().Get(
 				gomock.Any(),
@@ -132,7 +136,7 @@ func TestSubmitAggregateSelectionProof(t *testing.T) {
 			).SetArg(
 				2,
 				structs.AggregateAttestationResponse{
-					Data: jsonifyAttestation(aggregateAttestation),
+					Data: attestationJSON,
 				},
 			).Return(
 				test.aggregateAttestationErr,