Addendum to #12395.

Restored synchronous behavior for `HttpConnection.close()`.
This allows to send a response for suspended requests while the server is being stopped.

See also #12435.

Signed-off-by: Simone Bordet <simone.bordet@gmail.com>

jetty-core/jetty-server/src/main/java/org/eclipse/jetty/server/internal/HttpConnection.java

@@ -620,20 +620,7 @@ public void close()
     {
         Runnable task = _httpChannel.onClose();
         if (task != null)
-        {
-            ThreadPool.executeImmediately(getExecutor(), () ->
-            {
-                try
-                {
-                    task.run();
-                }
-                finally
-                {
-                    super.close();
-                }
-            });
-            return;
-        }
+            task.run();
         super.close();
     }