Remove redundant template instantiations from table contains

[PointKernel]

Description

Related to #21973

Follows #23282

This PR removes redundant explicit template instantiations from table contains. contains_table.cu already instantiates the required primitive and nested implementations, so the separate instantiation TUs only add compile work and object code.

In an uncached CUDA 13.0 build, this eliminates the 1,455s nested TU and the 665s primitive TU. The affected object size drops from 7.98 MB to 3.96 MB.

Runtime performance is unchanged on B200.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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ℹ️ Recent review info

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Run ID: ecbd0930-719c-4039-9bc1-571449d3c699

📥 Commits

Reviewing files that changed from the base of the PR and between 35f8f9f and dde403e.

📒 Files selected for processing (4)

• cpp/CMakeLists.txt
• cpp/src/search/contains_table_impl.cu
• cpp/src/search/contains_table_impl_nested.cu
• cpp/src/search/contains_table_impl_primitive.cu

💤 Files with no reviewable changes (3)

• cpp/src/search/contains_table_impl_nested.cu
• cpp/src/search/contains_table_impl_primitive.cu
• cpp/CMakeLists.txt

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📝 Walkthrough

Summary by CodeRabbit

• Bug Fixes
  • Improved the build and linking of table-contains functionality by removing obsolete compiled components.
  • Preserved the primary contains implementation while eliminating redundant specialized variants.
• Maintenance
  • Simplified internal implementation structure and reduced compilation overhead.

Walkthrough

The contains implementation removes explicit template instantiations, simplifies its includes and aliases, and updates the cudf build target to exclude the separate nested and primitive CUDA compilation units.

Changes

Contains implementation cleanup

Layer / File(s)	Summary
Remove contains instantiations cpp/src/search/contains_table_impl.cu	The file header and setup are simplified, and non-nested explicit dispatch_nan_comparator and perform_contains instantiations are removed.
Update cudf source list cpp/CMakeLists.txt	The cudf target no longer compiles the nested and primitive contains implementation sources.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested labels: Performance

Suggested reviewers: pmattione-nvidia

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: removing redundant template instantiations from table contains.
Description check	✅ Passed	The description is directly related to the changeset and explains the redundant instantiations removal and its impact.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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