Show assignment in enhanced view for students only
Show assignment in enhanced view for students only

Student grades page assignment titles should take graders and
observers to submission details page

closes EVAL-2078
flag=assignments_2_student

Test plan:
Have a course with some assignments, students, teachers and
observers.

With the FF ON:
1. As a teacher or an observer, go to a student's grades page.
Clicking on an assignment should show the submission details
page.
2. As a student, go to the student grades page. Clicking on an
assignment should show assignment in improved submission flow.

With the FF OFF:
1. Clicking on the assignment title should take you to submissions
details page whether as a student, teacher or observer

Change-Id: Iae160fb42b70ac919481280738b81b41737d8873
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/278031
QA-Review: Eduardo Escobar <7e82d09bba767b0dd1222915e3d92141089e94a8@instructure.com>
Reviewed-by: Spencer Olson <7cc0890d6f1f70810a023e7173eca5724d6c8e49@instructure.com>
Reviewed-by: Aaron Shafovaloff <d0ee6b99167c663aba7bc3efd806fe8d6cad437b@instructure.com>
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Product-Review: Jody Sailor

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