[Subtask]: Improve the unit tests for module Flink

[lklhdu]

Search before asking

• I have searched in the issues and found no similar issues.

What would you like to be improved?

Unit testing is an important part of ensuring the quality of open-source projects and we need to improve unit test cases in Flink module.

Parent issue

#937

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Subtasks

• [Bug]: Github CI always fails for EOFExceptions #1364
• [Subtask][Flink]: integrate the new unit testing framework #1440
• [Subtask][Flink]: turn on all unit tests annotated with @Ignore  #1596
• [Subtask][Flink]: improve unit test coverage in Flink module #1597
• [Improvement][Flink]: Externalize HMS、Kafka env to decrease the cost of Flink UTs #696

Code of Conduct

• I agree to follow this project's Code of Conduct

[github-actions]

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