chore(cudf.pandas): remove stale xfail entries for tests no longer in pandas

[vyasr]

Remove 38 stale entries from NODEIDS_THAT_FAIL in pandas-testing-plugin.py that reference test node IDs which no longer exist in the pandas 3.x test suite. Also add a missing xfail for a pre-existing failure.

What changed

Removed 38 stale xfail entries that can never match any collected test (the referenced node IDs no longer exist in pandas 3.x):

Test Function	Reason Stale	Entries Removed
test_interval_can_hold_element	Test removed from pandas	24
test_period_can_hold_element	Test removed from pandas	8
test_searchsorted_castable_strings	Parametrization changed	6

Added 1 xfail entry for test_infer_objects_reference — a pre-existing np.shares_memory assertion failure under cudf.pandas copy-on-write semantics (same class as the already-tracked test_infer_objects_no_reference).

Net change

-38 lines, +1 line in python/cudf/cudf/pandas/scripts/pandas-testing-plugin.py

Verification

• Removed tests confirmed absent from pandas 3.0.3 test collection in CI
• test_infer_objects_reference confirmed as sole remaining failure in CI run after stale removal
• File parses cleanly: python -c "import ast; ast.parse(...)"
• All pre-commit hooks pass

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR updates the cudf.pandas test plugin configuration by removing 38 lines of outdated known-failure entries for datetime searchsorted and interval/period can-hold-element tests, and adding a new entry for a flaky copy_view test.

Changes

Known Test Failures Configuration

Layer / File(s)	Summary
Remove outdated datetime and internals test entries python/cudf/cudf/pandas/scripts/pandas-testing-plugin.py	Deleted 38 lines of known-failure entries: datetime TestDatetimeArray::test_searchsorted_castable_strings with pyarrow_numpy-series parametrizations, and TestCanHoldElement::test_interval_can_hold_element and test_period_can_hold_element across multiple lambda and dtype parametrizations.
Add flaky copy_view test entry python/cudf/cudf/pandas/scripts/pandas-testing-plugin.py	Added a known-failures entry for tests/copy_view/test_methods.py::test_infer_objects_reference marked as "Flaky/version-sensitive cudf.pandas dispatch".

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• rapidsai/cudf#22705: Both PRs modify the same pandas-testing-plugin.py known-failures mapping, updating expected test failure entries.
• rapidsai/cudf#22618: Both PRs update cudf.pandas expected-failure test mappings for test_searchsorted_castable_strings and related datetime/internals tests.

Suggested reviewers

• mroeschke
• galipremsagar
• brandon-b-miller

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change: removing stale xfail entries for tests no longer in pandas, which is the core objective of this PR.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.
Description check	✅ Passed	The pull request description clearly and specifically describes the changes made: removing 38 stale xfail entries from the pandas-testing-plugin.py file and adding 1 new xfail entry, with detailed tables and reasoning.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[vyasr]

/merge