Use async APIs in random MR ref tests

[bdice]

Description

Updates the random async MR ref allocation helper to call stream-aware allocate() and deallocate() APIs instead of the synchronous APIs. This makes the random async allocation tests exercise stream-ordered resource paths as the test name indicates.

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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[coderabbitai]

📝 Walkthrough

Walkthrough

Test function test_random_async_allocations in the memory resource test suite was updated to call async allocation and deallocation APIs with explicit stream management instead of their synchronous counterparts, ensuring proper stream synchronization for non-default streams.

Changes

Async Allocation API Testing

Layer / File(s)	Summary
Stream-aware async allocation test cpp/tests/mr/mr_ref_test.hpp	test_random_async_allocations switched from synchronous allocate_sync and deallocate_sync to async allocate(stream, ...) and deallocate(stream, ...) calls; non-default streams are explicitly synchronized after each allocation.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Suggested reviewers

• ttnghia

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the main change: updating random MR ref tests to use async APIs instead of synchronous ones.
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.
Description check	✅ Passed	The pull request description clearly explains the changes: updating async MR ref allocation tests to use stream-aware async APIs instead of synchronous ones, making the tests properly exercise stream-ordered resource paths as intended.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[bdice]

/merge