[FLINK-39966][table-planner] FlinkRelMdModifiedMonotonicity wrongly reports a non-time-attribute Top-1 Rank as insert-only

[lincoln-lil]

What is the purpose of the change

FLINK-34702 removed the dedicated StreamPhysicalDeduplicate metadata handler and re-routed deduplication monotonicity through StreamPhysicalRank, but the new dispatch guard only checked RankUtil.isDeduplication (Top-1 ROW_NUMBER without rank number). It dropped the sortOnTimeAttributeOnly invariant the old node type implicitly carried.

Brief change log

• Tighten the guard to isDeduplication && sortOnTimeAttributeOnly restoring the original logic.
• Add proper test cases

Verifying this change

This change added tests and can be verified as follows:

• Added plan tests to RankTest.scala
• Added metadata tests to FlinkRelMdModifiedMonotonicityTest.scala

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)

[flinkbot]

CI report:

• 6110638 Azure: SUCCESS

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