Adf 1901 manage pagination export publications

https://issues.unige.ch/browse/AOU-1908

https://issues.unige.ch/browse/AOU-1901

AoU-Admin/src/main/java/ch/unige/aou/controller/admin/ExportPublicationController.java

@@ -137,13 +137,13 @@ public class ExportPublicationController extends SolidifyController {
     return switch (format) {
       case XML -> "metadata.xml";
       case JSON -> "metadata.json";
-      case CSV -> "metadata.csv";
+      case TSV -> "metadata.tsv";
     };
   }
 
   private String getContentType(ExportFormat format) {
     return switch (format) {
-      case CSV -> "text/csv";
+      case TSV -> "text/tab-separated-values";
       case XML -> "application/xml";
       case JSON -> "application/json";
     };