[fix][flaky-test] fix cumulative ack test after abort redeliver message by users
### Motivation
since merged, when the client abort txn with cumulative ack, We need to the redeliver message manually
### Modifications
change test when transaction abort with cumulative ack, redeliver message manually
### Verifying this change
@@ -606,6 +606,7 @@ public class TransactionEndToEndTest extends TransactionTestBase {
Assert.assertNull(message);
abortTxn.abort().get();
+ consumer.redeliverUnacknowledgedMessages();
Transaction commitTxn = getTxn();
for (int i = 0; i < messageCnt; i++) {
message = consumer.receive(1, TimeUnit.SECONDS);
