The "atlas_out_<test_name>.json" artifacts shown up in the "Files" tab of WT performance tests has a broken link, making users unable to access the collected data point values in the json file while investigating perf issues. Users can still check the collected data on the trend graph but it sometimes helpful to check the json file as well.

Here is an Evergreen task example and a screenshot:

The scope of the ticket is to fix up the link to the json artifacts file for various WT perf tests (not only many-collection-test).