Replace all @Query with DSL

The "text" mode @Query syntax in JPA repositories is impossible to maintain as the data models are updated and changed.

Migrate all cases where @Query is used to QueryDSL. Use the following approach:

1. If the query is used from a single service method, implement the query in the service method
2. If the query is used from multiple service methods, implement the query in a ...CustomImpl and extend the repository with a ...Custom interface