Pull request to allow test group to use extern cpp for mixed test runners

[dreamer-coding]

Fossil Logic Layer Pull Request

Description

This PR allows test cases in C++ to be externally accessible to a given test runner in C allowing smooth process between C and C++ for projects using C, C++ or both.

Testing

Same test cases to ensure nothing broke

Checklist

• Code follows the project's coding standards.
• Tests have been added or updated to cover the changes.
• Documentation has been updated to reflect the changes.
• The code has been reviewed by team members.
• All checks and tests pass.
• The license header and notices are updated where necessary.

License

This project is licensed under the Mozilla Public License - see the LICENSE file for details.