Fix managed memory smoke test

[gevtushenko]

Description

CCCL tests require managed memory. For instance, all thrust tests that are added with DECLARE_VECTOR_UNITTEST check if universal vector works. Current smoke implementation didn't trigger an error if system hasn't supported managed memory.

Checklist

• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 926e07e and d8a85e7.

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• test/cuda_smoke/cuda_runtime_smoke.cu

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📝 Walkthrough

Summary by CodeRabbit

• Tests
  • Updated the managed-memory CUDA smoke test to fail when managed memory is not available, instead of skipping the check.
  • This makes unsupported environments easier to detect during validation and improves test reliability.

Walkthrough

This change modifies a CUDA smoke test for cudaMallocManaged. Previously, the test would skip execution when device managed-memory support was absent; now it uses REQUIRE to assert support unconditionally, causing the test to fail instead of skip on unsupported devices.

Changes

Smoke Test Assertion Update

Layer / File(s)	Summary
Managed memory capability gate test/cuda_smoke/cuda_runtime_smoke.cu	Replaced the SKIP(...) branch with REQUIRE(managed_supported), so the test fails rather than skips when cudaDevAttrManagedMemory is false.

important: This change causes the test to fail (rather than skip) on devices/platforms lacking managed memory support. Confirm all CI/runner targets actually support managed memory, or this will break builds on unsupported hardware.

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