Remove unnecessary classes in quarkus sample app

[HKayed]

Description

There are some packages which don't have much of a usage in the branch with the database support. Test entities were added hence they are rendered useless.
https://github.com/devonfw-sample/devon4quarkus-cicd-testapp-service-b/tree/master-db-support
We would like to remove these packages.

Acceptance Criteria

1. Remove the packages com.devonfw.cicd.testapp.hello.service and com.devonfw.cicd.testapp.hello.logic
2. Make sure they don't impact the project being built successfully