revert exception change

Author: zhongkechen

sdk/src/main/java/software/amazon/lambda/durable/operation/ChildContextOperation.java

@@ -150,8 +150,8 @@ private void checkpointSuccess(T result) {
     private void handleChildContextFailure(Throwable exception) {
         exception = ExceptionHelper.unwrapCompletableFuture(exception);
         if (exception instanceof SuspendExecutionException) {
-            // The execution is going to suspend. do nothing
-            return;
+            // Rethrow Error immediately — do not checkpoint
+            ExceptionHelper.sneakyThrow(exception);
         }
         if (exception instanceof UnrecoverableDurableExecutionException) {
             terminateExecution((UnrecoverableDurableExecutionException) exception);