Add ARIA attrs to outcome alignment modal link

Fixes CNVS-14009

Test Plan:
- create a course with a learner
- Turn on the Student Learning Mastery Gradebook
- Add an outcome group and an outcome
- Navigate to the grades for a student, then the learning mastery tab
- Expand outcome group and verify the alignments link has 2 ARIA attrs
  - aria-owns="outcome_detail"
  - aria-hasspopup="true"
- Click the alignments link and verify the modal has an id of
  "outcome_detail"

Change-Id: I6e78b177530b3150e82ed3d126b3cd80762b4473
Reviewed-on: https://gerrit.instructure.com/37512
Reviewed-by: Joel Hough <joel@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
QA-Review: Steven Shepherd <sshepherd@instructure.com>
Product-Review: Matt Fairbourn <mfairbourn@instructure.com>