API / Import does not overwrite metadata if any validation status (geonetwork#7703)

Test:
* create record, validate
* export as MEF
* modify MEF
* import with overwrite mode fails to update.

If validation status table is empty, overwrite is working
```sql
TRUNCATE TABLE validation;
```

Not sure this is the proper fix for that issue.

Author: fxprunayre

domain/src/main/java/org/fao/geonet/repository/MetadataValidationRepositoryCustom.java

@@ -51,7 +51,7 @@ public interface MetadataValidationRepositoryCustom {
      * @param metadataId the id of the metadata.
      * @return the number of rows deleted
      */
-    @Modifying(clearAutomatically=true)
+    @Modifying(flushAutomatically = true, clearAutomatically = true)
     @Transactional
     @Query(value="DELETE FROM MetadataValidation v where v.id.metadataId = ?1 AND valtype != 'inspire'")
     int deleteAllInternalValidationById_MetadataId(Integer metadataId);