TNL-4877

This reverts commit 943a3a5e.

TNL-5402

TNL-5083

TIL about defining variables in Mako templates.

Exposes real_user to the user_dropdown template, allowing for the requested
feature change of keeping the profile links pointed at the real user's profile.

TNL-5686

It should help catch unicode encoding problems earlier.

This also updates python-saml dependency to a version that includes a
patch for unicode strings.

TNL-5465

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.

TNL-5458
TNL-5493

* First take at forcing a subsection's grade to update when a signal is
  sent that a problem's score has changed
* Refactor signal handler connection.
* Expand bokchoy tests to cover progress page
* Add some grading unit tests

TNL-5394
TNL-5364

Some StudentModule entries were written with newlines at the end of the
course_id. This script finds those entries within a given time range,
archive them, and merges records if necessary (capa problems).

clear request cache to avoid memory leak

update to use https

delete courses in the same transaction as writing them

python3 compatibility

ECOM-5081

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.