Private readonly string changed to private const string (#1288)

Author: Facundo La Rocca

src/BuildingBlocks/EventBus/EventBusRabbitMQ/EventBusRabbitMQ.cs

@@ -21,12 +21,12 @@ namespace Microsoft.eShopOnContainers.BuildingBlocks.EventBusRabbitMQ
     public class EventBusRabbitMQ : IEventBus, IDisposable
     {
         const string BROKER_NAME = "eshop_event_bus";
+        const string AUTOFAC_SCOPE_NAME = "eshop_event_bus";
 
         private readonly IRabbitMQPersistentConnection _persistentConnection;
         private readonly ILogger<EventBusRabbitMQ> _logger;
         private readonly IEventBusSubscriptionsManager _subsManager;
         private readonly ILifetimeScope _autofac;
-        private readonly string AUTOFAC_SCOPE_NAME = "eshop_event_bus";
         private readonly int _retryCount;
 
         private IModel _consumerChannel;
@@ -86,7 +86,6 @@ public void Publish(IntegrationEvent @event)
 
             using (var channel = _persistentConnection.CreateModel())
             {
-
                 _logger.LogTrace("Declaring RabbitMQ exchange to publish event: {EventId}", @event.Id);
 
                 channel.ExchangeDeclare(exchange: BROKER_NAME, type: "direct");