OZG-6988 cleanup after review

src/main/java/de/ozgcloud/admin/RootModelAssembler.java

src/main/java/de/ozgcloud/admin/common/DtoService.java

.../java/de/ozgcloud/admin/reporting/AggregationMapping.java

...zgcloud/admin/reporting/AggregationMappingRepository.java

.../ozgcloud/admin/setting/SettingEnvironmentRepository.java

...ain/java/de/ozgcloud/admin/setting/SettingRepository.java

src/main/java/de/ozgcloud/admin/setting/SettingService.java

...zgcloud/admin/OzgCloudDelegatingResourceMetadataTest.java

src/test/java/de/ozgcloud/admin/RootModelAssemblerTest.java

...oud/admin/reporting/AggregationMappingDtoTestFactory.java

...zgcloud/admin/reporting/AggregationMappingMapperTest.java

...d/admin/reporting/AggregationMappingRepositoryITCase.java

...ing/ReportingAggregationMAnagerSettingDtoTestFactory.java

...ing/ReportingAggregationManagerSettingDtoServiceTest.java

...de/ozgcloud/admin/security/SecurityConfigurationTest.java

...a/de/ozgcloud/admin/setting/SettingEnvironmentITCase.java

...va/de/ozgcloud/admin/setting/SettingRepositoryITCase.java