add routes for to ember quizzes for moderate and rubric tabs

fixes CNVS-12445

test plan:
  - enable fabulous quizzes
  - open up ember quizzes#show page
  - click on the moderate tab and see content text: "Moderate"
  - click on the rubric tab and see content text: "Rubric"

Change-Id: Ic1753939cf3ea830715902ec0d740bb6e4de9ca9
Reviewed-on: https://gerrit.instructure.com/33482
Reviewed-by: Ahmad Amireh <ahmad@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Caleb Guanzon <cguanzon@instructure.com>
Product-Review: Derek DeVries <ddevries@instructure.com>