SSDM-5025 : Refactoring

...ugins/sync/harvester/synchronizer/EntitySynchronizer.java

...s/sync/harvester/synchronizer/ResourceListParserData.java

...arallelizedExecutor/AttachmentSynchronizationSummary.java

...elizedExecutor/AttachmentSynchronizationTaskExecutor.java

...llelizedExecutor/DataSetRegistrationIngestionService.java

...parallelizedExecutor/DataSetRegistrationTaskExecutor.java

...r/parallelizedExecutor/DataSetSynchronizationSummary.java

...ins/sync/harvester/synchronizer/util/DSPropertyUtils.java

...dss/plugins/sync/harvester/synchronizer/util/V3Utils.java