[FLINK-33396][table-planner] Fix table alias not be cleared in subquery

[xuyangzhong]

What is the purpose of the change

Clear the table alias in sub-query

Brief change log

• Clear table alias in ClearQueryBlockAliasResolver
• Update existent tests

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?

[flinkbot]

CI report:

• 5ab4575fe5a4a1dd70938d7352b8e577a9512d7f Azure: SUCCESS

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