[FLINK-40283][tests] Rename CorrelateITCase2 to Correlate2ITCase to make executing while CI/local tests

[snuyanzin]

What is the purpose of the change

The problem is with pom where pattern for unit tests does not run integration tests ending with something different than ITCase

Brief change log

test rename

Verifying this change

CI logs should contain Correlate2ITCase

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 applicable)

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[flinkbot]

CI report:

• 8dace57 Azure: SUCCESS

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