3410 remove question type from question metadata

[witchpou]

#3410

Please let us talk about the following topics before merge:

• database update for mongodb and elastic search
  • alte import-Dateien sollten weiter importiert werden
  • Feld sollte auch in der MongoDB angepasst werden
  • Warning bei veralteten Feld
• migration script for production, if fields should be deleted completely in existing data
• update setup-data for development environment
• remove question type from metadata import
• correct question import file in wiki https://github.com/dzhw/metadatamanagement/wiki/Metadata-Import
  (should old metadata import scripts are working anyway)
• clarify zofar export
  • importer muss legacy-cases berücksichtigen, sollte aber nicht in die Datenbank
• field type of TechnicalRepresentation.java was deleted -> what is it?
  • das Feld sollte drin bleiben