Reenable fixed figure-pickling tests in pandas shards

[galipremsagar]

Description

Remove four stale figure-pickling entries from NODEIDS_TO_SKIP_WHEN_SHARDED (#22992). Period and concrete-offset pickle reducers added by #23054 already resolve this group on main.

This is a marker-only change on an independent main-based branch. It is separate from the plotting-option isolation fix: these four cases pass even after the known xaxis.compat polluter.

Validation

• All 12 figure-pickling cases passed.
• All four previously skipped cases pass with normal plotting options and after the option polluter.
• Independent full plotting shards: 569 passed / 584 passed, zero failures, with the other plotting skips retained.
• Ruff and whitespace checks passed.

Tested with pandas 3.0.3 and checked-out Python sources. Local native libraries are cuDF 26.10 (main is 26.12); an external startup hook loads the installed extension and maps the exact GPU mask API rename. No CPU implementation substitute or environment modifications were used. Matching native-library validation remains for CI. Plotting itself intentionally uses pandas/Matplotlib.

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 310b5be and f72dace.

📒 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

• Bug Fixes
  • Plotting pickle tests are no longer skipped, allowing them to run as part of the pandas test suite.

Walkthrough

The pandas testing plugin removes four known-failure skip entries for TestTSPlot.test_pickle_fig cases involving DataFrame and Series inputs.

Changes

Plot pickle tests

Layer / File(s)	Summary
Remove plotting pickle skips python/cudf/cudf/pandas/scripts/pandas-testing-plugin.py	Removes skip configuration for four TestTSPlot.test_pickle_fig cases covering DataFrame and Series inputs.

Priority: ⬇️ Low

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

Merge Risk: ⚪ Minimal · up to 1ca30

This change reenables four plotting pickle test cases. 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 figure-pickling tests in pandas shards.
Description check	✅ Passed	The description directly explains the four removed skip entries, the supporting fixes, 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 8fb7e0a

[galipremsagar]

/okay to test 1ca305b