This reverts commit 8c009881, reversing
changes made to 5b6e2dd5.

nit: css

TNL-5990

Remove deprecated SingleSectionGrader.  TNL-5987
Remove display_name and module_id from Scores objects
Update CourseGradeFactory.__init__ to not be user-specific
Update some callers to use CourseGrade class instead of "summary" dict
Remove no longer needed course_grades.py module.
Renamed django signal from GRADES_UPDATED to COURSE_GRADE_CHANGED

This reverts commit d59ab18b, reversing
changes made to 0ebab35e.

Initial commit

TNL-5484

TNL-5835

As part of the Robust Grades rollout, we expect to see some DatabaseErrors in
various methods that write to the database. Since the success of this write
operation is not needed for the end-user, we just log and swallow the error.

In the future, we'll also enqueue an async task to finish the write operation
that failed.

Discussion is restricted to the CCX course (there is no sharing of
discussions with the parent course or other CCX instances).

Hooks the pre-existing grades code into our new PersistentSubsectionGrade data
model. Includes test updates, and some minor changes to the data model that
were discovered in testing.

ECOM-4890

Adds ENABLE_SUBSECTION_GRADES_SAVED feature flag to both lms and cms. Also
installs the wiring that will allow robust grades to be used for courses
that enable it. This functionality is still gated by the feature flag
and should not be used until the remaining robust grades work is finished.

TNL-5002

https://openedx.atlassian.net/browse/TNL-5008

Converts the dates on the dashboard, sidebar navigation, and important course dates to user specified time zone.

Performance improvement, this cache is no longer needed thanks
to block_structure caching data.

TNL-4874