test: Validate existent yml files

[dricazenck]

Description

Create unit test to open yml files and convert to dictionary and by that validate if the yml is valid. In case it is not it will return empty dictionary and the test will failure.

In case the test failure it will failure the checks and it will block merge of the related pull request.

Change Type

• [ ] Bug Fix
• [ ] New Feature
• [x] Code Refactor
• [ ] Mentor Update
• [ ] Documentation
• [ ] Other

Screenshots

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Please check if your PR fulfills the following requirements:

• [x] I checked and followed the contributor guide
• [x] I have tested my changes locally.
• [x] I have added a screenshot from the website after I tested it locally