Update CI settings

- Run tests coverage on Scrutinizer
- Run `php_analyzer` on Scrutinizer
- Run `php_mess_detector` on Scrutinizer
- Exclude tests/* and vendor/* from Scrutinizer paths
- Allow `code_rating` and `duplication` checks on Scrutinizer

You can check the inspections on Scrutinizer by https://scrutinizer-ci.com/g/henriquemoody/Validation/?branch=build-settings