fix issues with quiz question creation on quizzes with existing submission data

fixes CNVS-11539

test plan:
- as a teacher
  - create a new quiz with multiple choice questions
  - publish the quiz

- as a student
  - take the quiz

- as a teacher
  - edit the quiz, and add new questions to the quiz
  - try to remove answers for the new question as you're creating it
  - try to create different question types for the new question
  - it should allow you to add new questions fine with no errors
  - when you remove or change answers you should not get any regrade options
  - click 'update question' for this question
  - after you have successfully update the question, you should get all the
    regrade options and restrictions around deleting answers or changing
    the question type.

- make sure there are no regressions with the test plans in:
  - CNVS-9853
  - CNVS-10868

Change-Id: I08f350db8f0f09e2c3d8480d1b4a55853d86b09a
Reviewed-on: https://gerrit.instructure.com/33226
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Caleb Guanzon <cguanzon@instructure.com>
Reviewed-by: Josh Simpson <jsimpson@instructure.com>
Product-Review: Derek DeVries <ddevries@instructure.com>