fix: Remove newly added exceptionally handling in JdkA2AHttpClient

Author: fjuma

http-client/src/main/java/io/a2a/client/http/JdkA2AHttpClient.java

@@ -125,9 +125,7 @@ public void onComplete() {
             // Send the response async, and let the subscriber handle the lines.
             return httpClient.sendAsync(request, bodyHandler)
                     .thenAccept(response -> {
-                        if (!JdkHttpResponse.success(response)) {
-                            subscriber.onError(new IOException("Request failed " + response.statusCode()));
-                        }
+                        // Status checking is now handled in the body handler
                     });
         }
     }