BIS-1031 Add retry mechanism to import with removed broken entries

What

• Remove entries with problems during import and retries the import a couple of times
• Provide feedback for entries that didn't work

Testing

There are unit tests for parsing the exception messages.

openbis/lib-rdf/test-data/sphn-model/rdf_schema_sphn_dataset_release_2024_2.ttl can be used as test data. If there are problems with timeouts, there's a much smaller file long_code_smaller.ttl.

lib-rdf/src/main/java/ch/ethz/sis/rdf/main/mappers/NamedIndividualMapper.java

@@ -54,9 +54,8 @@ public class NamedIndividualMapper
         try {
             String optionLabel = model.getProperty(subject, RDFS.label).getString();
             //TODO check with Juan for increasing vocabulary type code length > 50
-            String optionCode = subject.getLocalName().length() > 50 ? subject.getLocalName().substring(0, 49).toLowerCase(Locale.ROOT) : subject.getLocalName().toUpperCase(Locale.ROOT);
             VocabularyTypeOption option = new VocabularyTypeOption(
-                    optionCode,
+                    subject.getLocalName(),
                     optionLabel,
                     subject.getURI());