remove TestWitnessJson and change it to ExecutionWitness

src/Nethermind/Ethereum.Test.Base/TestBlockJson.cs

@@ -1,8 +1,9 @@
 // SPDX-FileCopyrightText: 2022 Demerzel Solutions Limited
 // SPDX-License-Identifier: LGPL-3.0-only
 
-using System.Text.Json;
 using System.Text.Json.Serialization;
+using Nethermind.Core.Verkle;
+using Nethermind.Serialization.Json;
 
 namespace Ethereum.Test.Base
 {
@@ -12,7 +13,8 @@ public class TestBlockJson
         public TestBlockHeaderJson[]? UncleHeaders { get; set; }
         public string? Rlp { get; set; }
         public LegacyTransactionJson[]? Transactions { get; set; }
-        public TestWitnessJson? Witness { get; set; }
+        [JsonConverter(typeof(ExecutionWitnessConverter))]
+        public ExecutionWitness? Witness { get; set; }
         [JsonPropertyName("expectException")]
         public string? ExpectedException { get; set; }
     }