fix: prevent possible connection leak in AutorecoveringConnection during creation (#1857)

* fix: prevent possible connection leak in AutorecoveringConnection during creation

* fix: use "FailedOpen" reason text when closing AutorecoveringConnection after inner connection open error

This matches the behavior used when normal connection opening fails.

Author: krisz2000

projects/RabbitMQ.Client/Impl/AutorecoveringConnection.cs

@@ -96,8 +96,28 @@ internal static async ValueTask<AutorecoveringConnection> CreateAsync(Connection
                 .ConfigureAwait(false);
             Connection innerConnection = new(config, fh);
             AutorecoveringConnection connection = new(config, endpoints, innerConnection);
-            await innerConnection.OpenAsync(cancellationToken)
-                .ConfigureAwait(false);
+            try
+            {
+                await innerConnection.OpenAsync(cancellationToken)
+                    .ConfigureAwait(false);
+            }
+            catch
+            {
+                try
+                {
+                    await connection.CloseAsync(Constants.InternalError, "FailedOpen",
+                        InternalConstants.DefaultConnectionCloseTimeout, true,
+                        cancellationToken).ConfigureAwait(false);
+                    await connection.DisposeAsync()
+                        .ConfigureAwait(false);
+                }
+                catch
+                {
+                }
+
+                throw;
+            }
+
             return connection;
         }