use clowder endpoint to set flag not to do extraction on uploaded streetview images.

for some extractors, like greenroute, will upload large number of images back to clowder, and usually the uploader or user will just consider the metadata of greenroute extractor itself.

This flag set to false will let clowder not to trigger any extraction on uploaded files. So such large number of files will not overload the system of extractors.

by default, we always run extraction on uploaded files to datasets.