AT:

• Remove unnecessary tracking of variable ids and activity ids in respective types
• The types are not used in the import performance tests anymore
• The adjustments in the config file are also transferred to the documentation (e.g. removal of a configuration field).

Context:
We used those types to track which entities have already been instances. However, with the upsert mechanism and the rewriting of the import we ensure that data is not imported multiple times differently and thus don't need those types anymore. Also adding data to elasticsearch which is not used later on yields performance losses.