fix: Remove newly added exceptionally handling in JdkA2AHttpClient

Author: fjuma

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

@@ -185,11 +185,6 @@ public void onComplete() {
             return httpClient.sendAsync(request, bodyHandler)
                     .thenAccept(response -> {
                         // Status checking is now handled in the body handler
-                    })
-                    .exceptionally(throwable -> {
-                        // handle any other async errors (network issues, etc.)
-                        subscriber.onError(new IOException("Request failed: " + throwable.getMessage(), throwable));
-                        return null;
                     });
         }
     }