GcsSinkTaskGroupByTopicPartitionPropertiesTest.limited takes very long time

[ivanyu]

After upgrade to google-cloud-nio:0.123.24 (and associated google-cloud-storage:2.4.5), GcsSinkTaskGroupByTopicPartitionPropertiesTest.limited started running very long time. It used to be a couple of minutes, but is unknown (I wan't patient enough to wait beyond 20 minutes).

Some crude profiling of this line

            Instant started = Instant.now();
            task.flush(null);
            System.out.println(Duration.between(started, Instant.now()).toMillis());

shows that the time in flush grew about 10x.
No significant difference in profiles collected by async-profiler in cpu and wall modes.

The test will be disabled and should be enabled once this is fixed.