Plugins should have a valid CODEOWNERS file

[alecharp]

Description

Resolves #498.

It is good practice for each plugin to have a CODEOWNERS file to notify the maintainers of any contributions.

Based on https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners#about-code-owners, CODEOWNERS file can be located in root, .github or in docs folder.

Testing done

Adds tests for the new probe and validate the scoring.

Submitter checklist

Beta Give feedback

1. If an issue exists, it is well described and linked in the description
2. The description of this pull request is detailed and explain why this pull request is needed
3. The changeset is on a specific branch. Using feature/ for new feature, or improvements ; Using fix/ for bug fixes ; Using docs/ for any documentation changes.
4. If required, the documentation has been updated
5. There is automated tests to cover the code change / addition or an explanation why there is no tests in the description.