- Use Symfony `Process` to handle the database file import command execution.
- Update QA tool to support `docker compose`.
- Drop support for `docker-compose`.
- Update all QA tool images to `php:7.4-alpine` except `composer`.
- Update QA tool binary paths to `vendor/bin`.
- remove obsolete `e2e` QA tool.
- Fix some typos and clean up some parts of the code.
- Clean up `.gitlab-ci.yml`.
- Migrate `phpunit.xml` using `phpunit`.