Remove deprecations from 26.02

[jcrist]

This removes almost all the remaining deprecations (outside of #7751). The only one I didn't handle was deprecations in TargetEncoder since I couldn't figure out what the intended behavior was. Will leave that for others.

Summary:

• Removes deprecated cuml.internals.memory_utils module
• Removes deprecated TotalIters for cuml.svm
• Removes deprecated y parameter in train_test_split
• Removes deprecated parameters to UMAP (fixes Remove checks for deprecated nnd_* build_kwds in UMAP #7709)

[coderabbitai]

📝 Walkthrough

Summary by CodeRabbit

• Chores
  • Removed deprecated y parameter from train_test_split() function
  • Removed deprecated TotalIters class from SVM models
  • Removed memory_utils from public API namespace
  • Cleaned up legacy parameter handling and deprecation warnings in UMAP

Walkthrough

This PR removes multiple deprecated features and their associated warnings across the cuml library: memory_utils from the public API, the TotalIters wrapper class in SVM, the y parameter from train_test_split, the nnd_* build parameters in UMAP, and related test coverage.

Changes

Cohort / File(s)	Summary
Memory utilities cleanup cuml/internals/__init__.py, cuml/internals/memory_utils.py	Removed memory_utils from public API exports and eliminated module-level __getattr__ deprecation wrapper for set_global_output_type and using_output_type attributes. Updated copyright year to 2026.
UMAP build parameters cuml/manifold/umap/umap.pyx	Removed deprecated nnd_* build parameter handling; replaced with direct knn_n_clusters/overlap_factor extraction, added validation (n_clusters >= 1, overlap_factor < n_clusters when n_clusters > 1), and removed deprecation warnings and legacy branching.
SVM deprecation removal cuml/svm/svm_base.pyx	Removed TotalIters deprecated wrapper class, eliminated associated runtime warnings and deprecation logic in _params_to_cpu and _fit methods, simplified max_iter parameter handling.
train_test_split refactoring cuml/model_selection/_split.py	Removed deprecated y parameter from function signature, eliminated all related docstring documentation, validation branches, and control flow handling.
Test suite updates tests/test_reflection.py, tests/test_svm.py, tests/test_train_test_split.py	Removed test coverage for deprecated features: memory_utils deprecation warnings (test_deprecated_memory_utils), TotalIters wrapper usage, and y parameter handling in train_test_split (~146 lines removed).

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~15 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Remove deprecations from 26.02' accurately reflects the main objective of the PR, which is to remove deprecated features introduced in version 26.02.
Description check	✅ Passed	The description clearly outlines what deprecations are being removed (memory_utils, TotalIters, y parameter, UMAP parameters) and relates directly to the changeset.
Linked Issues check	✅ Passed	The PR successfully addresses issue #7709 by removing deprecated nnd_* build_kwds handling and warnings from UMAP, plus removes other deprecations as stated in the PR description.
Out of Scope Changes check	✅ Passed	All changes are within scope: memory_utils removal, TotalIters removal, y parameter removal, and UMAP deprecation handling are all explicitly listed as PR objectives.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[csadorf]

/merge