feat: validate metadata dates

https://issues.unige.ch/browse/AOU-289

AoU-ResourceServerCommon/src/test/java/ch/unige/aou/test/MetadataExtractorV1Test.java

@@ -351,9 +351,9 @@ public class MetadataExtractorV1Test {
     assertEquals("http://www.example.com/dataset", datasetMap.get("url"));
 
     Dates dates = depositDoc.getDates();
-    assertEquals("2020-11-18T00:00:00.000Z", dates.getDate().get(0).getContent());
+    assertEquals("2020", dates.getDate().get(0).getContent());
     assertEquals("FIRST_ONLINE", dates.getDate().get(0).getType().name());
-    assertEquals("2021-01-07T00:00:00.000Z", dates.getDate().get(1).getContent());
+    assertEquals("07.01.2021", dates.getDate().get(1).getContent());
     assertEquals("PUBLICATION", dates.getDate().get(1).getType().name());
 
     AcademicStructures academicStructures = depositDoc.getAcademicStructures();