fix: [datafetcher] Remove cached data since it is not relevant

This cached data was made if we fetched all triples and then we
filter them. It is not the case here since we retrieve from the
sparql endpoint only necessary triples (which uses a predicate
in the format values list).
4 jobs for topic/default/fetchdata-no-cache in 4 minutes and 59 seconds (queued for 27 seconds)