capture additional failure info from turnitin

fixes CNVS-12682

Test Plan:
  make sure turnitin still works

Change-Id: Ifd3d8d560b89add408a0a2e9134b109e6cd999eb
Reviewed-on: https://gerrit.instructure.com/35155
Reviewed-by: Strand McCutchen <smccutchen@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Josh Simpson <jsimpson@instructure.com>
Reviewed-by: Simon Williams <simon@instructure.com>
QA-Review: Amber Taniuchi <amber@instructure.com>
Product-Review: Hilary Scharton <hilary@instructure.com>