redirect non-permissioned users away from moderate

closes CNVS-12804

test plan:
  - enable fabulous quizzes
  - as an instructor
    - navigate to moderate tab on fabulous quizzes
      - moderate tab should display
  - as a student
    - navigate to moderate tab on fabulous quizzes
      - should be redirected (with a notice) back to fabulous quiz show

Change-Id: Ifc184195a5540724036975e86055bd3ea9745310
Reviewed-on: https://gerrit.instructure.com/34201
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Josh Simpson <jsimpson@instructure.com>
QA-Review: Caleb Guanzon <cguanzon@instructure.com>
Product-Review: Jason Madsen <jmadsen@instructure.com>