Use CUML_KERNEL for remaining kernels

[ahmedtaha100]

@divyegala @csadorf

Closes #6532

Summary

This fixes NVIDIA/cuml issue #6532, "Create preprocessor macros to standardize annotations." CUML_KERNEL already exists in cpp/include/cuml/common/utils.hpp, so this patch uses it instead of defining another macro.

• Use CUML_KERNEL for all 16 remaining C++ CUDA kernels.
• Include <cuml/common/utils.hpp> directly in each affected file.

Ten of these kernels were already declared static __global__. The other six gain internal linkage through CUML_KERNEL, so they no longer produce externally linked kernel symbols.

The Python NVRTC RawKernel strings remain unchanged because Python loads those kernels by name at runtime. Their extern "C" entry points must remain visible.

Kernel bodies and public APIs are unchanged.

Validation

• All applicable changed-file pre-commit hooks passed.
• CUDA 12.9 builds passed for cuml, SG_ISOLATION_FOREST_TEST, and SG_RF_TEST.
• RAPIDS detect-weak-linking reported no externally linked CUDA kernel symbols in the built libcuml.so. Upstream conda-cpp-checks uses the same detector.
• git diff --check passed.
• A full C++ source search found no raw __global__ void kernel definitions.

This patch adds no unit test because runtime tests do not directly inspect linkage. The targeted builds compile every changed translation unit, and detect-weak-linking checks the resulting libcuml.so.

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[ahmedtaha100]

Could a maintainer please add the improvement and non-breaking labels? Label Checker requires one category and one compatibility label, and GitHub does not allow outside contributors to apply them. Thanks!

[divyegala]

Thank you for the contribution!

[divyegala]

/ok to test c74847c

[ahmedtaha100]

Fixed the copyright lint failure in 64858f6. The follow-up only updates the two headers emitted by verify-copyright-cuml, and all applicable local hooks pass. Could you please run /ok to test 64858f6 for the new head? Thanks!

[divyegala]

/ok to test 64858f6

[ahmedtaha100]

The lint fix now passes, but the remaining jobs fail before building during AWS OIDC authentication. It looks infrastructure-related, but if there’s anything I can correct on the PR side, I’m happy to implement it. Thank you! @divyegala

[divyegala]

Thanks @ahmedtaha100 , we just changed organizations for this repository so we may see some transient errors. I'll follow up and run CI when it is ready, and let you know if there are any real failures related to this PR.

[ahmedtaha100]

Great thank you for your help!