include blueprint info in assignments index
include blueprint info in assignments index

test plan:
 - the assignments index should include

   is_master_course_master_content /
   is_master_course_child_content

   for assignments that are shared from / to blueprint courses,
   similarly to the index pages for discussion topics, pages,
   and quizzes

closes LS-2756

Change-Id: I650ef677ddb267e2475de7718e10c28e5c4b8e58
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/277878
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
Reviewed-by: Eric Saupe <e7287cf05ae62bc45889f17a9d34b8fae8d5afd1@instructure.com>
QA-Review: Eric Saupe <e7287cf05ae62bc45889f17a9d34b8fae8d5afd1@instructure.com>
Product-Review: Jeremy Stanley <b3f594e10a9edcf5413cf1190121d45078c62290@instructure.com>

sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms,sfu/canvas-lms