Display of status of all flows (GradingOpportunity objects) that needed to be submit for students

Some students complain it hard to find which flows they have submit/ forgotten to submit, and which they just don't know they need to submit. It seems difficult to display the information in the course page. Can that information be integrated into the gradebook_participant template?

Start by locating the gradebook_participant template and the course-page entry point, then inspect how GradingOpportunity objects expose submission status. Done means the gradebook participant view clearly shows which flows students submitted, forgot to submit, or did not know required submission; the issue names no tests to run.

Written by the indexing model from the issue text.