[FLINK-23133][python] Properly handle the dependencies when mixing use of Python Table API and Python DataStream API

[dianfu]

What is the purpose of the change

*This pull request fixes the problem that the dependencies are not handled correctly when mixing use of Python Table API and Python DataStream API. *

Brief change log

• Handle the dependencies when converting DataStream to Table

Verifying this change

This change added tests and can be verified as follows:

• Added tests test_add_python_file_2

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/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)

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Automated Checks

Last check on commit 04f2c13 (Thu Jun 24 07:48:16 UTC 2021)

✅no warnings

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Review Progress

• ❓ 1. The [description] looks good.
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• ❓ 3. Needs [attention] from.
• ❓ 4. The change fits into the overall [architecture].
• ❓ 5. Overall code [quality] is good.

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CI report:

• 04f2c13 Azure: SUCCESS

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[HuangXingBo]

LGTM