[FLINK-32374][table-planner] Fix the issue that ExecNodeGraphInternalPlan#writeToFile should support TRUNCATE_EXISTING for overwriting

[LadyForest]

What is the purpose of the change

This pull request is cherry-picked from commit f69ed34

Brief change log

Please see #22820

Verifying this change

Please see #22820

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? N.A.

[flinkbot]

CI report:

• dbc3813 Azure: SUCCESS

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