JSON files should be validated according to the schema file automatically on every PR

[sdolgin]

As discussed with @UmarMohamedUsman we have an existing schema definition which tells us the fields that are required in order for the JSON to be valid. It would be great to reference the schema in the JSON files (and drive VS Code IntelliSense probably? 🤔)... or at least have the JSON checked on every PR similar to the linting check.