add CancelSendVerificationSms flag to InstitutionContractExtensionCompleteRequest and update SMS sending logic

CompanyManagment.App.Contracts/InstitutionContract/InstitutionContractExtensionCompleteRequest.cs

@@ -7,6 +7,7 @@ public class InstitutionContractExtensionCompleteRequest
     public Guid TemporaryId { get; set; }
     public bool IsInstallment { get; set; }
     public long LawId { get; set; }
+    public bool CancelSendVerificationSms { get; set; }
 }
 
 public class InstitutionContractCreationCompleteRequest