Reenable fixed GroupBy value_counts tests in pandas shards

[galipremsagar]

Description

Remove nine stale GroupBy value_counts entries from NODEIDS_TO_SKIP_WHEN_SHARDED (#22992).

The original CI failures were KeyError: Column not found: both: these tests create a GroupBy, add a column to its parent DataFrame, then select that column through the existing GroupBy. #22998 already fixed this stale-parent intermediate-proxy bug and added regression coverage, but these shard-only skips remained.

Independent main-based, marker-only change.

Validation

• All nine cases pass individually and in both broader module shards.
• Independent full value_counts module: 184 passed, 14 xfailed, 25 explicitly non-strict xpassed, no failures.
• Both broader stack/value_counts shards with the separate descriptor fix integrated: 619 passed / 584 passed, no failures. Existing upstream xfails/non-strict xpasses remain unchanged.
• All applicable pre-commit hooks passed.

Tested with pandas 3.0.3 and source Python using installed cuDF 26.10 native libraries (main is 26.12), with an external hook for the installed extension and exact GPU mask API rename. No environment or vendored pandas test changes were made. Matching native-library validation remains for CI.

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📥 Commits

Reviewing files that changed from the base of the PR and between 0d92fc8 and 36258c0.

📒 Files selected for processing (1)

• python/cudf/cudf/pandas/scripts/pandas-testing-plugin.py

💤 Files with no reviewable changes (1)

• python/cudf/cudf/pandas/scripts/pandas-testing-plugin.py

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📝 Summary

Summary by CodeRabbit

• Tests
  • Expanded pandas compatibility test coverage for groupby.value_counts scenarios.
  • Previously skipped cases are now included in the test suite, helping validate behavior across additional grouping and counting workflows.

Walkthrough

The pandas testing plugin no longer skips nine groupby.value_counts test cases for frame and series groupby operations.

Changes

Groupby value-counts test enablement

Layer / File(s)	Summary
Remove groupby value-counts skips python/cudf/cudf/pandas/scripts/pandas-testing-plugin.py	Removed skip registrations for nine test_against_frame_and_seriesgroupby value-counts tests.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 3a69e

Nine previously skipped GroupBy value-count tests are enabled, with the supplied test results showing they pass in targeted and broader test runs. No current merge-blocking risk is identified.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: re-enabling fixed GroupBy value_counts tests in pandas shards.
Description check	✅ Passed	The description directly explains the removal of nine stale skips, the earlier fix, and the validation results.
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.

✨ 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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[galipremsagar]

/okay to test eb51e89

[galipremsagar]

/okay to test 3a69e57