remove the set parallelism 1

[github-actions]

remove the set parallelism 1

https://github.com/databloom-ai/incubator-wayang/blob/9cd36ffc61387bf546ee402c98051028dc0b005f/wayang-platforms/wayang-flink/code/main/java/org/apache/wayang/flink/operators/FlinkObjectFileSink.java#L81

        assert inputs.length == this.getNumInputs();
        assert outputs.length <= 1;
        final FileChannel.Instance output;
        final String targetPath;
        if(outputs.length == 1) {
            output = (FileChannel.Instance) outputs[0];
            targetPath = output.addGivenOrTempPath(this.textFileUrl, flinkExecutor.getConfiguration());
        }else{
            targetPath = this.textFileUrl;
        }

        //TODO: remove the set parallelism 1
        DataSetChannel.Instance input = (DataSetChannel.Instance) inputs[0];
        final DataSink<Type> tDataSink = input.<Type>provideDataSet()
                .write(new WayangFileOutputFormat<Type>(targetPath), targetPath, FileSystem.WriteMode.OVERWRITE)

230be8395e50fc6a14e22c979811d50f3bc30276