Removed unused imports from lms/envs

Currently the registration endpoint has no rate limit. Added a new ratelimit
variable to support the change, it's value is set to 60/7d.

VAN-302

The setting overrides should've been cleaned up in a previous
commit, but I missed them. This change is a no-op.

VAN-312

This reverts commit fc06846c.

* pyupgrade in lms dir

* replace wildcard

* pep8 fix

* fix quality

We use django-ratelimit to limit per IP login attempts, and then we use
django-ratelimit-backend to limit per username login attempts. This
change replaces the usage of django-ratelimit-backend with another
instance of django-ratelimit so that both limits can be managed by one
library.

This is the first step in being able to fully excise
django-ratelimit-backend from edx-platform. Note that we're still using
the `RateLimitMixin` in openedx/core/djangoapps/oauth_dispatch/dot_overrides/backends.py
because studio and the admin UI still relies on that for rate limiting.
Those login paths will have to be updated before we can remove the mixin
from our auth backend.

MST-637: edx-proctoring 3.0.0 now requires a new key for use in ID
generation, starting from same value as SECRET_KEY (pre-rotation, but
rotation never happened for devstack.)

Remote config changes already made for relevant environments.

VAN-300

Deprecated edx-platform import paths
(for example, `student` instead of
`common.djangoapps.student`) currently raise
warnings when used. We want to fully remove
support for those paths.

As an easily reversible way to initially remove
support, we add a new setting to LMS and Studio
called `ERROR_ON_DEPRECATED_EDX_PLATFORM_IMPORTS`,
defaulting to False. We set it to True for devstack
and will set it to True in Stage and Production
soon. If critical errors occur, we can easily
flip the setting back to False.

The login page had a hard-coded support.edx.org URL.  This changes it to
a configurable setting. BTR-32.

* Install `organizations` app into LMS and Studio non-optionally.
* Add toggle `ORGANIZATIONS_AUTOCREATE` to Studio.
* Remove the `FEATURES["ORGANIZATIONS_APP"]` toggle.
* Use the new `organizations.api.ensure_organization` function to
  either validate or get-or-create organizations, depending
  on the value of `ORGANIZATIONS_AUTOCREATE`,
  when creating course runs and V2 content libraries.
  We'll soon use it for V1 content libraries as well.
* Remove the `util.organizations_helpers` wrapper layer
  that had to exist because `organizations` was an optional app.
* Add `.get_library_keys()` method to the Split modulestore.
* Add Studio management command for backfilling organizations tables
  (`backfill_orgs_and_org_courses`).

For full details, see
https://github.com/edx/edx-organizations/blob/master/docs/decisions/0001-phase-in-db-backed-organizations-to-all.rst

TNL-7646

* MST-542 remove the IDV redirect to Account MFE waffle flag to permanently redirect learners to new IDV workflow. This completes the rollout process on edx-platform

* Generate common/djangoapps import shims for LMS
* Generate common/djangoapps import shims for Studio
* Stop appending project root to sys.path
* Stop appending common/djangoapps to sys.path
* Import from common.djangoapps.course_action_state instead of course_action_state
* Import from common.djangoapps.course_modes instead of course_modes
* Import from common.djangoapps.database_fixups instead of database_fixups
* Import from common.djangoapps.edxmako instead of edxmako
* Import from common.djangoapps.entitlements instead of entitlements
* Import from common.djangoapps.pipline_mako instead of pipeline_mako
* Import from common.djangoapps.static_replace instead of static_replace
* Import from common.djangoapps.student instead of student
* Import from common.djangoapps.terrain instead of terrain
* Import from common.djangoapps.third_party_auth instead of third_party_auth
* Import from common.djangoapps.track in...

* Use full LMS imports paths in LMS settings and urls modules
* Use full LMS import paths in Studio settings and urls modules
* Import from lms.djangoapps.badges instead of badges
* Import from lms.djangoapps.branding instead of branding
* Import from lms.djangoapps.bulk_email instead of bulk_email
* Import from lms.djangoapps.bulk_enroll instead of bulk_enroll
* Import from lms.djangoapps.ccx instead of ccx
* Import from lms.djangoapps.course_api instead of course_api
* Import from lms.djangoapps.course_blocks instead of course_blocks
* Import from lms.djangoapps.course_wiki instead of course_wiki
* Import from lms.djangoapps.courseware instead of courseware
* Import from lms.djangoapps.dashboard instead of dashboard
* Import from lms.djangoapps.discussion import discussion
* Import from lms.djangoapps.email_marketing instead of email_marketing
* Import from lms.djangoapps.experiments instead of experiments
* Import from lms.djangoapps.gat...

This patch would enable routing learner to logistration MFE
via forgot password url than on platform when
ENABLE_LOGISTRATION_MICROFRONTEND feature flag is set.

VAN-98

update logistration MFE feature flag to not be used in conjunction
with Accounts MFE toggle.

VAN-11

Removed most of the deprecated shoppingcart app, leaving just enough to allow us to cleanly remove the related database tables later. Also removed the relevant Django settings that weren't in use elsewhere.

Replace django-celery with django-celery-results
Upgrade redis to latest

PROD-880

* Moving plugins infrastructure to edx-django-utils
This PR extracts the code that enables plugins in edx-platform and puts it in edx-django-utils. This is done to allow other IDAS to add plugin functionality.

* using new welcome template when redirected from enterprise proxy login view

* enabling safe redirects to enterprise learner portal from login in devstack

* ading admin portal to login redirect whitelist

* running make upgrade to version bump edx-enterprise

PROD-1506

* fix old migrations
* fix a test
* fix enable-migrations cmd argument
* enhance verbose logging to log migrations
* update testing doc with help

Change to map first name to edx username by default oauth SSO with `identityserver3` backend
ENT-2709

Addressed reviewer's feedback

Part of removal of OpenID Connect

* Removing all settings that have OIDC in name

* Removing ENABLE_DOP_ADAPTER

* changes JWT_ISSUER value in devstack