fix(hipblaslt): Clear nodiscard warnings from sk5 unit tests

[pmckinno]

JIRA ID : AIHPBLAS-4199

[therock-pr-bot]

❌ PR Check — Action Required

Check	Status	Details
📝 PR Description	❌ Fail	Error: PR description is too short (23 characters). Expected: at least 30 characters. Current: please provide a meaningful description of your changes
⛔ Forbidden Files	✅ Pass	—
🧪 Unit Test	✅ Pass	PR does not contain code files — Unit Test auto-passed
🔎 pre-commit	✅ Pass	—
🚫 Draft PR	🔜 To Be Enabled	—
🚩 Feature Flag	🔜 To Be Enabled	—
📊 Code Coverage	🔜 To Be Enabled	—

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