Adds question label to matching selection boxes
Adds question label to matching selection boxes

Closes CNVS-19265

Test Plan:
  - Confirm that form_mode navigation to question answer elements provides
    reference to the question prompt, and item label on matching
    questions.

Change-Id: I6e21b2ad213e10cf2f4f1bc505b5738be4b3e21a
Reviewed-on: https://gerrit.instructure.com/50810
Tested-by: Jenkins
Reviewed-by: Brian Finney <6d3e3f1a68388efca72d0ac9c9ecbc1039d2a9c2@instructure.com>
QA-Review: Amber Taniuchi <ef4bfd1e6d278f6bc7d4a478f02be2cb9581a0a5@instructure.com>
Product-Review: Ryan Taylor <2eafa1f6bf34395b543d6ca7f438461b0774d24f@instructure.com>

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