added fieldmask to resultstore upload for RBE

tools/run_tests/python_utils/upload_rbe_results.py

@@ -122,7 +122,7 @@ def _get_resultstore_data(api_key, invocation_id):
     while True:
         req = urllib2.Request(
             url=
-            'https://resultstore.googleapis.com/v2/invocations/%s/targets/-/configuredTargets/-/actions?key=%s&pageToken=%s'
+            'https://resultstore.googleapis.com/v2/invocations/%s/targets/-/configuredTargets/-/actions?key=%s&pageToken=%s&fields=id,status_attributes,timing,test_action'
             % (invocation_id, api_key, page_token),
             headers={
                 'Content-Type': 'application/json'