iterating over.

The mako engine isn't able to find themed templates in devstack because
the path it checks is set before we enable comprehensive theming. This
Adds a settings section to  comment out if you want to enable
theming in devstack.

- use login_ajax (in place of login_session with shim) for
logistration's call to login POST
- add toggle for using login_ajax from logistration
  - FEATURES['ENABLE_LOGIN_POST_WITHOUT_SHIM']
- add custom metrics for redirect_url
- update test for third-party auth error_code

NOTE: The error_code `third-party-auth-with-no-linked-account`
was introduced in JSON in this earlier PR:
https://github.com/edx/edx-platform/pull/22452/files

ARCH-1253

Learners should not be able to view final grade before course end
date.Suppress the grade achieved so far till course end date on
dashboard.

PROD-701

When migrating from python 2 to 3 we can get in a situation where the
cache has data that the new version of python can't read.  In this case
drop the bad data and re-cache the correct data.

iterating over.

ENT-1961 | Making the manual enrollment reason field optional via configuration flag `ENABLE_MANUAL_ENROLLMENT_REASON_FIELD`.

This patch would enable a user to run management
command via jenkins job. Verification ids
are injected via a configuration model.

PROD-1005

Scheduled emails show "unsubscribe" link if waffle switch
`schedules.course_update_show_unsubscribe` is enabled, and
settings.ACE_ENABLED_POLICIES respects `bulk_email_optout`.

API endpoint allows GET/POST requests, which:

* GET asks for confirmation of opt-out
* POST accepts "unsubscribe" or "cancel", where "unsubscribe" creates the
  Optout entry, and "cancel" does nothing.

Fixes flaky tests:

* The resolvers handle users in "bins", which are groups that depend on the user ID.
* The test user ID varies depending on the test order.
* This change ensures that the bin requested matches the user for the test.

Students can't create team in an instructor-managed topic

Add an LMS feature flag to enable courseware search for course staff
only. TNL-6931

This completes the work started in https://github.com/edx/edx-platform/pull/19453
to use the LMS login and registration for Studio, rather than Studio
providing its own implementation.

LMS login/registration are being used for the following reasons:
1. LMS logistration properly handles all SSO integrations.
2. A single logistration is simpler to maintain and understand.
3. Allows Studio to work more like all other IDAs that use LMS
logistration.

The original switch to use LMS logistration for Studio also added the
toggle `DISABLE_STUDIO_SSO_OVER_LMS` to provide the community some
additional time for switching. This commit removes this toggle, which
at this point means all deployments will use the LMS logistration.

This change requires sharing cookies across LMS and Studio. Should that
prove to be a problem for certain Open edX instances, there are
discussions of possible alternative solutions.
See https://github.com/edx/edx-platform/pull/19845#issuecomment-559154256

Detailed changes:
* Fix some Studio links that still went to old Studio signin and signup.
* Remove DISABLE_STUDIO_SSO_OVER_LMS feature toggle.
* Remove old studio signin and signup pages and templates.
* Fix url name "login", which had different meanings for Studio and LMS.
* Use the following settings: LOGIN_URL, FRONTEND_LOGIN_URL,
FRONTEND_LOGOUT_URL, and FRONTEND_REGISTER_URL.
* Redirect /signin and /signup to the LMS logistration.
* Add custom metric `uses_pattern_library`.
* Add custom metric `student_activate_account`.
* Add Django Settings to allow /signin, /signup, and /login_post to be
disabled once ready.

This work also relates to ARCH-218 and DEPR-6.

ARCH-1253

Adds "Manage" sub-tab to course "Teams" tab
with UI for downloading and uploading team
membership CSVs. The upload and download function-
ality are currently not implemented.

The new tab only appears when the user is course staff
and the course has at least one instructor-managed
team-set, which is not the case for any existing
courses, so not current course staff will see this
change.

This ticket will be followed-up upon in MST-44 and
MST-49.

MST-41

PROD-1004

* no student change to instructor managed team

* Address comments & fix unit tests

* fix jenkins test failure

* Fix eslint errors

* Fix xss warnings

* Fix bokchoy test

Currently, Resubmit photo-verification button is not been displayed
inside the approval box on dashboard.In order to allow a learner to
resubmit before expire it must be displayed in it.