Add PDS-H benchmark results to cudf.pandas docs

[btepera]

Description

Updates cudf.pandas benchmarks in our docs to report PDS-H results rather than our outdated duckdb benchmarks.

Also allows us to drop reference to data.rapids.ai from this page of our docs.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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[btepera]

I'm not sure if there's something better to call this, since canonically PDS-H is referring to Polars' benchmarks. Our benchmarking scripts call these PDS-H still so kept that way for now.

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📝 Summary

Summary by CodeRabbit

• Documentation
  • Replaced the database-like operations benchmark documentation with PDS-H benchmark results.
  • Added GPU cudf.pandas versus CPU pandas comparisons at scale factor 50.
  • Updated the results figure and added steps for reproducing the benchmark.

Walkthrough

Changes

PDS-H benchmark documentation

Layer / File(s)	Summary
Update benchmark overview and reproduction reference docs/cudf/source/cudf_pandas/benchmarks.md	Replaces Database-like operations benchmark content with PDS-H documentation, SF50 GPU and CPU results, an updated figure link, and reproduction guidance.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to 69cf1

This updates the cudf.pandas benchmark documentation to report PDS-H SF50 results and reproduction guidance. No concrete merge-blocking risk remains.

Suggested reviewers: bdice

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely identifies the addition of PDS-H benchmark results to the cudf.pandas documentation, which matches the main change.
Description check	✅ Passed	The description accurately explains the replacement of outdated DuckDB benchmark results with PDS-H results and the removal of the data.rapids.ai reference.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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