Remove deprecated arrow_filter_policy alias

[PointKernel]

Description

This PR removes the deprecated cudf::arrow_filter_policy<Hash> alias in favor of cudf::arrow_bloom_filter_policy<Key, Hash>. It was deprecated in 26.10 by #23671 and has no remaining users in libcudf.

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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📥 Commits

Reviewing files that changed from the base of the PR and between 8f02800 and 705403e.

📒 Files selected for processing (1)

• cpp/include/cudf/reduction/bloom_filter.cuh

💤 Files with no reviewable changes (1)

• cpp/include/cudf/reduction/bloom_filter.cuh

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📝 Summary

Summary by CodeRabbit

• Removed
  • Removed the deprecated cudf::arrow_filter_policy<Hash> alias.
  • Use the supported cudf::arrow_bloom_filter_policy<Key, Hash> policy instead.

Walkthrough

The change removes the deprecated cudf::arrow_filter_policy<Hash> alias. The supported cudf::arrow_bloom_filter_policy<Key, Hash> policy remains available.

Changes

Bloom filter policy cleanup

Layer / File(s)	Summary
Remove deprecated policy alias cpp/include/cudf/reduction/bloom_filter.cuh	Removes the deprecated cudf::arrow_filter_policy<Hash> alias and its deprecation guidance. The supported Arrow bloom filter policy remains unchanged.

Priority: ⬇️ Low

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

Change: Other

Merge Risk: ⚪ Minimal · up to 70540

The deprecated alias removal matches the supported API transition and no unresolved merge-blocking issue is established.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely identifies the main change: removal of the deprecated arrow_filter_policy alias.
Description check	✅ Passed	The description directly explains the removal of cudf::arrow_filter_policy<Hash>, its replacement, deprecation history, and related validation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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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