fix(over window): fix table iter pk prefix to use deduped partition key

[stdrc]

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What's changed and what's your intention?

When iterating a sub-range on state table, we should've used deduplicated partition key as table pk prefix, but the original partition key was actually used. This PR fixes it.

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
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Release note

If this PR includes changes that directly affect users or other significant modifications relevant to the community, kindly draft a release note to provide a concise summary of these changes. Please prioritize highlighting the impact these changes will have on users.

[stdrc]

• perf(over window): skip remaining affected rows when rank is not changed #18950
• perf(over window): pass through Updates not affecting window function outputs #19056
• perf(over window): avoid recompute information about window frames #19036
• fix(over window): fix table iter pk prefix to use deduped partition key #19081 👈
• main

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