Use rapids_test_add() again

[KyleFromNVIDIA]

Description

As of rapidsai/rapids-cmake#1050, rapids_test_install_relocatable() correctly relocates tests with arguments, so we can use rapids_test_add() again.

Checklist

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

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: 56015e61-7bfb-450e-af57-8875cb2ca6ea

📥 Commits

Reviewing files that changed from the base of the PR and between 2988889 and 6481d05.

📒 Files selected for processing (1)

• cpp/libcudf_streaming/tests/CMakeLists.txt

💤 Files with no reviewable changes (1)

• cpp/libcudf_streaming/tests/CMakeLists.txt

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📝 Walkthrough

Summary by CodeRabbit

• Chores
  • Updated the test setup to use a standardized test registration and installation flow.
  • Improved how streaming tests are registered (including multi-rank runs) and installed, making execution more consistent across environments.
  • Simplified test packaging by removing custom install/path-rewrite logic and switching to a relocatable install approach.

Walkthrough

This PR migrates cpp/libcudf_streaming/tests/CMakeLists.txt to rapids-test helpers for test registration and relocatable installation.

Changes

Test registration and install migration

Layer / File(s)	Summary
rapids-test initialization cpp/libcudf_streaming/tests/CMakeLists.txt	Includes and initializes rapids-test, replacing the manual build-tree CTestTestfile.cmake setup.
mpirun and single-test registration cpp/libcudf_streaming/tests/CMakeLists.txt	Registers mpirun and single-process tests with rapids_test_add, using $<TARGET_FILE:...> and INSTALL_COMPONENT_SET testing.
relocatable install wiring cpp/libcudf_streaming/tests/CMakeLists.txt	Replaces the custom install and relocation script logic with rapids_test_install_relocatable for bin/gtests/libcudf_streaming.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Possibly related PRs

• rapidsai/cudf#22864: Both PRs modify cpp/libcudf_streaming/tests/CMakeLists.txt and the mpirun-based test registration flow.
• rapidsai/cudf#22954: Both PRs change test registration and install/relocation logic in the same CMake test setup.

Suggested reviewers: vyasr, bdice

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: switching back to rapids_test_add().
Description check	✅ Passed	The description is directly related to the test registration and relocatable install fix.
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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[KyleFromNVIDIA]

/merge