Remove async from unit tests - Closes #2834

[michielmulders]

What was the problem?

Failing unit tests for database because of error error: relation "mem_round_snapshot" already exists.

How did I fix it?

Remove async from describe function callback as all tests are started in parallel while removing/creating this specific table. No need for async here.

How to test it?

Locally this does not happen.
Re-run Jenkins build for this branch.

Review checklist

• The PR resolves Fix intermittent test failure for database unit tests #2834
• All new code is covered with unit tests
• All new code was formatted with Prettier
• Linting passes
• Tests pass
• Commit messages follow the commit guidelines
• Documentation has been added/updated

[TeamCyberCrypto]

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