extract ember submission arrows to mixin to use on both teacher/student results

fixes CNVS-13633

test plan:
  - enable draft state and quiz stats
  - as a teacher
    - create a quiz with some questions and allow students to see results
    - take the quiz and get some correct, some incorrect
    - you should see arrows showing which are correct/incorrect

    - preview the quiz and get some correct, some incorrect
    - you should see arrows showing which are correct/incorrect

  - as a student
    - take the quiz
    - you should see arrows showing which are correct/incorrect

Change-Id: Ic275b386df84c5b1e6ca5930f345a524de38bbee
Reviewed-on: https://gerrit.instructure.com/36439
Reviewed-by: Jason Madsen <jmadsen@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Trevor deHaan <tdehaan@instructure.com>
Product-Review: Derek DeVries <ddevries@instructure.com>