remove unused code

src/DotNetCore.CAP.AzureServiceBus/CAP.AzureServiceBusOptions.cs

@@ -31,10 +31,5 @@ namespace DotNetCore.CAP
         /// Represents the Azure Active Directory token provider for Azure Managed Service Identity integration.
         /// </summary>
         public ITokenProvider ManagementTokenProvider { get; set; } 
-
-        /// <summary>
-        /// Used to generate Service Bus connection strings
-        /// </summary>
-        public ServiceBusConnectionStringBuilder ConnectionStringBuilder { get; set; }
     }
 }
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