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

[Jiabao-Sun]

What is the purpose of the change

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

Brief change log

[FLINK-32850][flink-runtime][JUnit5 Migration] The io.network.netty 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:

• 51452ee Azure: SUCCESS

Bot commands

The @flinkbot bot supports the following commands:

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

[JingGe]

LGTM

[Jiabao-Sun]

Thanks @JingGe for the review.
Sorry for the delay in resolving the PR conflicts.