refactor[AOU-1816]: clean publication metadata in pivot format

...c/main/java/ch/unige/aou/business/PublicationService.java

.../ch/unige/aou/controller/admin/PublicationController.java

...n/java/ch/unige/aou/repository/PublicationRepository.java

...va/ch/unige/aou/service/metadata/MetadataExtractorV2.java

...rvice/metadata/imports/MetadataImportWorkFlowService.java

...ain/java/ch/unige/aou/service/storage/Fedora3Storage.java

...odel/src/main/java/ch/unige/aou/model/tool/CleanTool.java

...l/src/test/java/ch/unige/aou/test/tool/CleanToolTest.java