Remove stale single-GPU test xfails

[csadorf]

Removes 30 stale xfail markers identified across recent CI jobs and focused GB10 stress testing.

Closes #7734

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[csadorf]

/ok to test c9c647b

[csadorf]

/ok to test 8dce4fe

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Run ID: ab6ca973-785b-48a2-a2a7-c6454d83b8d0

📥 Commits

Reviewing files that changed from the base of the PR and between 729c432 and 8ad8e2c.

📒 Files selected for processing (4)

• python/cuml/tests/test_metrics.py
• python/cuml/tests/test_spectral_clustering.py
• python/cuml/tests/test_tsne.py
• python/cuml/tests/test_umap.py

💤 Files with no reviewable changes (2)

• python/cuml/tests/test_tsne.py
• python/cuml/tests/test_metrics.py

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📝 Walkthrough

Summary by CodeRabbit

• Tests
  • Removed expected-failure designations from metrics, spectral clustering, t-SNE, and UMAP tests.
  • These test scenarios now run as standard validations.
• Documentation
  • Updated copyright attribution in the spectral clustering test.

Walkthrough

The change removes expected-failure markers from four cuML tests. It also updates the SPDX copyright holder in the spectral clustering test file.

Changes

Expected-failure test audit

Layer / File(s)	Summary
Enable audited tests python/cuml/tests/test_metrics.py, python/cuml/tests/test_spectral_clustering.py, python/cuml/tests/test_tsne.py, python/cuml/tests/test_umap.py	Four tests now run without xfail markers. The spectral clustering SPDX notice now includes NVIDIA CORPORATION & AFFILIATES.

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

Mergeability Score: ⚪ Minimal · up to 8ad8e

This change only removes stale test exemptions and introduces no actionable merge-blocking risk; it is merge-ready after normal checks and review.

Suggested reviewers: jcrist

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Out of Scope Changes check	⚠️ Warning	The SPDX copyright holder update in test_spectral_clustering.py is unrelated to the linked XPASS audit objective [#7734].	Move the SPDX copyright update to a separate pull request or document why it is required for this change.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: removing stale single-GPU test xfail markers.
Description check	✅ Passed	The description directly relates the changes to removing stale xfail markers and auditing XPASS tests.
Linked Issues check	✅ Passed	The changes remove expected-failure markers from tests covered by the XPASS audit objective in issue [#7734].
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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