feat(tests): enhance Acta contract test coverage

- Added comprehensive tests for version retrieval, fee configuration, and vault management functionalities.
- Implemented tests to verify contract initialization, fee settings, and issuer authorization processes.
- Included assertions for expected behaviors, such as panic conditions when attempting to initialize or create vaults multiple times.
- Ensured that fee-related configurations are correctly set and retrieved, enhancing overall test robustness.

Author: JosueBrenes