[FLINK-30753][python] Fix the invocation process of Table.explain()

[yunfengzhou-hub]

What is the purpose of the change

This PR fixes the bug that PyFlink cannot invoke Explainable.explain() method through py4j.

Brief change log

• invoke
  String explain(ExplainFormat format, ExplainDetail... extraDetails)
  instead of
  String explain(ExplainDetail... extraDetails)
  when PyFlink uses this function.

Verifying this change

This change is already covered by existing tests, such as pyflink/table/tests/test_explain.py::StreamTableExplainTests::test_explain.

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): no
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, 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

[yunfengzhou-hub]

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CI report:

• 8bdcb25 Azure: PENDING

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