a11y: Modifies DOM order to influence tab order on user page.

fixes CNVS-14406

Test Plan:
  - Go to the account level user page
    (/accounts/##/users/##)
  - In the enrollments section, tabbing through should go to the
    course name before the unenroll link.
  - A screenreader should read the course name prior to the
    unenroll link.

Change-Id: I4436915218d89663a5d4563541e8e251af910038
Reviewed-on: https://gerrit.instructure.com/43767
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Dan Minkevitch <dan@instructure.com>
QA-Review: Jahnavi Yetukuri <jyetukuri@instructure.com>
Product-Review: Clay Diffrient <cdiffrient@instructure.com>