[FLINK-32850][flink-runtime][JUnit5 Migration] The io.network.partition package of flink-runtime module

[Jiabao-Sun]

What is the purpose of the change

[FLINK-32850][flink-runtime][JUnit5 Migration]

• The io.network.partition package of flink-runtime module
• The remaining tests in the io.network package of flink-runtime module

Verifying this change

This change is already covered by existing tests

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 documented)

[flinkbot]

CI report:

• 6aa8906 Azure: SUCCESS

Bot commands

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• @flinkbot run azure re-run the last Azure build

[Jiabao-Sun]

Hi @reswqa, please help review it when you have time.
Thanks.

[reswqa]

Thanks @Jiabao-Sun, +1 for merging.

[reswqa]

After this PR, whether all tests in io.network have been migrated?

[Jiabao-Sun]

After this PR, whether all tests in io.network have been migrated?

Yes. Thanks a lot.