show "Coming Up" list on wiki home page
show "Coming Up" list on wiki home page

test plan:
 - have a course with an assignment due in the future,
   and a student enrolled
 - set the home page to a wiki page
 - as the student, view the course home page.  the right sidebar
   should have a "Coming Up" section showing the upcoming assignment.

fixes CNVS-18405

Change-Id: Ie7f050c3c5b324583cffafd83a7a4e08a47cc8e3
Reviewed-on: https://gerrit.instructure.com/48544
Tested-by: Jenkins
Reviewed-by: Dan Minkevitch <2591e5f46f28d303f9dc027d475a5c60d8dea17a@instructure.com>
Product-Review: Dan Minkevitch <2591e5f46f28d303f9dc027d475a5c60d8dea17a@instructure.com>
QA-Review: Jahnavi Yetukuri <ed2b2672ccc2e59e56c0615df7f01b579202e014@instructure.com>

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