## What is the purpose of the change

This PR fixes two improper test cases that mistakenly use batchTestUtil for 
stream sql.

## Brief change log

Replaces the `batchTestUtil` with `streamTestUti`l in 
`SetOperatorsTest.testValuesWithCast()` and 
`CorrelateTest.testLeftOuterJoinAsSubQuery()`.

## 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, 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)


[ Full content available at: https://github.com/apache/flink/pull/6605 ]
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