Update/resolve deprecated Symfony functionality in our test CI
2x DEPRECATION: Loading the file "../src/Controller" from the global resource directory "/app/src" is deprecated since Symfony 4.4 and will be removed in 5.0. /app/vendor/symfony/http-kernel/Config/FileLocator.php:84
Example:
https://gitlab.com/foodsharing-dev/foodsharing/-/jobs/520050797