Bug 1521114 - remove trailing comma causing invalid artfacts.json r=tomprince

Differential Revision: https://phabricator.services.mozilla.com/D16989

--HG--
extra : moz-landing-system : lando

taskcluster/taskgraph/actions/create_interactive.py

@@ -69,7 +69,7 @@ def context(params):
     if int(params['level']) < 3:
         return [{'worker-implementation': 'docker-worker'}]
     else:
-        return [{'worker-implementation': 'docker-worker', 'kind': 'test'}],
+        return [{'worker-implementation': 'docker-worker', 'kind': 'test'}]
 
 
 @register_callback_action(