chore: remove unused code in SendBlobs tool (#9658)

* chore: remove unused imports from AccountException

* chore: remove unused TxDecoder variable in BlobSender

Author: strmfos

tools/SendBlobs/AccountException.cs

@@ -1,13 +1,6 @@
 // SPDX-FileCopyrightText: 2023 Demerzel Solutions Limited
 // SPDX-License-Identifier: LGPL-3.0-only
 
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Runtime.Serialization;
-using System.Text;
-using System.Threading.Tasks;
-
 namespace SendBlobs;
 internal class AccountException : Exception
 {

tools/SendBlobs/BlobSender.cs

@@ -92,7 +92,6 @@ public async Task SendRandomBlobs(
             signers.Add(new(new Signer(chainId, privateKey, _logManager), nonce));
         }
 
-        TxDecoder txDecoder = TxDecoder.Instance;
         Random random = new();
 
         int signerIndex = -1;