## What is the purpose of the change

Add an file output helper method, which requires only FileOutputFormat 
parameter, to DataSet API. This can avoid setting duplicate path parameters, 
since the output path could be found in FileOutputFormat.

## Brief change log

  - *Add an file output helper method, which requires only FileOutputFormat 
parameter, to DataSet API.*

## Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

## Does this pull request potentially affect one of the following parts:

  - Dependencies (does it add or upgrade a dependency): (no)
  - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: (yes)
  - The serializers: (no)
  - The runtime per-record code paths (performance sensitive): (no)
  - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
  - The S3 file system connector: (no)

## Documentation

  - Does this pull request introduce a new feature? (no)
  - If yes, how is the feature documented? (not applicable)


[ Full content available at: https://github.com/apache/flink/pull/6616 ]
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