Remove pip only skips of numba-cuda-mlir backend tests

[brandon-b-miller]

Conda packages are now provided for numba-cuda-mlir, cudf doesn't need these skips anymore.

[brandon-b-miller]

cc @mroeschke

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 215888d and 9e91dbd.

📒 Files selected for processing (3)

• python/cudf/cudf/tests/private_objects/mlir_backend/test_masked_lowering.py
• python/cudf/cudf/tests/private_objects/mlir_backend/test_masked_typing.py
• python/cudf/cudf/tests/private_objects/mlir_backend/test_plumbing.py

💤 Files with no reviewable changes (2)

• python/cudf/cudf/tests/private_objects/mlir_backend/test_masked_lowering.py
• python/cudf/cudf/tests/private_objects/mlir_backend/test_masked_typing.py

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📝 Walkthrough

Summary by CodeRabbit

• Tests
  • Updated MLIR backend tests to require the relevant MLIR integration during collection instead of silently skipping when it is unavailable.
  • Removed obsolete test dependency-skip handling.
• Documentation
  • Updated copyright attribution in the test suite.

Walkthrough

Changes

MLIR test dependency handling

Layer / File(s)	Summary
Direct MLIR test imports and metadata python/cudf/cudf/tests/private_objects/mlir_backend/test_masked_typing.py, python/cudf/cudf/tests/private_objects/mlir_backend/test_plumbing.py	The tests no longer use module-level pytest.importorskip("numba_cuda_mlir") setup. The plumbing test updates its SPDX copyright attribution.

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

Merge Risk: ⚪ Minimal · up to 9e91d

This change enables backend tests that were previously skipped; it is localized to test configuration and no actionable merge-blocking risk remains beyond normal checks and review.

Possibly related PRs

• NVIDIA/cudf#22886: Removes dependency skip logic from tests for masked lowering and typing code.
• NVIDIA/cudf#23310: Removes dependency-skipping setup from related masked MLIR tests.
• NVIDIA/cudf#23311: Removes dependency-based skips from the same masked MLIR test modules.

Suggested labels: Python

Suggested reviewers: matt711

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description explains that Conda packages are available and that the test skips are no longer needed.
Title check	✅ Passed	The title clearly identifies the removal of pip-only skips for numba-cuda-mlir backend tests.
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.

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• Create PR with unit tests

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[mroeschke]

Thanks! (Didn't realize these were here)

[brandon-b-miller]

/merge