[FLINK-40285][table] MLPredictSemanticTests fails because of ON CONFLICT

[snuyanzin]

What is the purpose of the change

The PR is to fix MLPredictSemanticTests by introducing InsertConflictStrategy.deduplicate() as for others like in #27426

Brief change log

MLPredictSemanticTests

Verifying this change

MLPredictSemanticTests

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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Was generative AI tooling used to co-author this PR?

• Yes (please specify the tool below)

Generated-by: [Tool Name and Version]

[flinkbot]

CI report:

• 1131fe3 Azure: SUCCESS

Bot commands

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[twalthr]

LGTM