test: unified unit test setup

[BohdanPetryshyn]

Proposed Changes

This PR sets up Jest tests for the Basti CLI package and unifies it with the existing Basti CDK tests.

Checklist

• [x] I cleaned up my code.
• [x] All the tests and checks passed (npm run test).
• [x] I have added necessary documentation and/or updated existing documentation.
• [x] I have added or modified tests to cover the changes.