fix: silence unused variable warnings in vc-vault test suite

[aguilar1x]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 11b1293a-47b1-4729-b6d3-28e99e6430f4

📥 Commits

Reviewing files that changed from the base of the PR and between 0eb1600 and 3be640e.

📒 Files selected for processing (1)

• contracts/vc-vault/src/test.rs

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🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/test-warnings

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