Add validation tests for wrapper module configuration

[marcelovilla]

Context

Implement automated tests using tofu test capabilities to validate that the module's syntax, composition logic, and variable handling are correct. These tests should run in CI on every commit to catch configuration errors early without requiring actual AWS deployments.

Value and/or benefit

This provides fast feedback on module correctness without incurring AWS costs or requiring lengthy integration test runs, ensuring the wrapper logic and example configurations remain valid as the module evolves.

Anything else?

No response