aria label for quiz questions
aria label for quiz questions

fixes CNVS-19262
fixes CNVS-18681

test plan:
 * using a screen reader
 - take a quiz with multiple choice questions
 > the screen reader should not repeat the question text
   for each choice
 - repeat for multiple answer questions (checkboxes)

Change-Id: I42ee2d287d0774595d3132c8dcedb7b6277535ac
Reviewed-on: https://gerrit.instructure.com/50834
Reviewed-by: Brian Finney <6d3e3f1a68388efca72d0ac9c9ecbc1039d2a9c2@instructure.com>
Tested-by: Jenkins
Reviewed-by: Ryan Taylor <2eafa1f6bf34395b543d6ca7f438461b0774d24f@instructure.com>
QA-Review: Amber Taniuchi <ef4bfd1e6d278f6bc7d4a478f02be2cb9581a0a5@instructure.com>
Product-Review: Cameron Sutter <853bcc0cb8f5834b7805e8eb9a762054be43c731@instructure.com>

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