Removed unused elements

Author: dalilaacqua

src/main/java/it/gov/pagopa/idpay/transactions/service/PointOfSaleTransactionServiceImpl.java

@@ -35,9 +35,7 @@
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.time.YearMonth;
-import java.time.format.DateTimeFormatter;
 import java.util.List;
-import java.util.Locale;
 import java.util.Objects;
 
 import static it.gov.pagopa.idpay.transactions.enums.RewardBatchStatus.*;
@@ -58,8 +56,6 @@ public class PointOfSaleTransactionServiceImpl implements PointOfSaleTransaction
   private final TransactionErrorNotifierService transactionErrorNotifierService;
   private final TransactionNotifierService transactionNotifierService;
 
-    private static final DateTimeFormatter BATCH_MONTH_FORMAT = DateTimeFormatter.ofPattern("yyyy-MM", Locale.ITALIAN);
-
   protected PointOfSaleTransactionServiceImpl(
           UserRestClient userRestClient, RewardTransactionRepository rewardTransactionRepository, InvoiceStorageClient invoiceStorageClient, RewardBatchService rewardBatchService,
       RewardBatchRepository rewardBatchRepository,