Change validation code to use the value of the proctoring_provider model when making a comparison instead of the entire model. Otherwise, the condition 'current_provider != requested_provider' always resolves to True.

In order to enable us to remove flag_undefined_default, this
updates flags according to alternatives documented in:
https://github.com/edx/edx-platform/blob/master/openedx/core/djangoapps/waffle_utils/docs/decisions/0001-refactor-waffle-flag-default.rst

These flags were updated with a migration:
- enable_checklists_quality
- REJECTED_EXAM_OVERRIDES_GRADE
- ENFORCE_FREEZE_GRADE_AFTER_COURSE_END
- WRITABLE_GRADEBOOK

ARCHBOM-1304

Add condition to check whether the user has requested a change to the proctoring_provider Advanced Setting. In the case that the setting is not available (i.e. the ENABLE_PROCTORING_PROVIDER_OVERRIDES waffle flag is not enabled for the course), the requested proctoring_provider will be None. We should consider, in this case, that the user has not requested a change to the proctoring_provider setting and therefore should not prevent the user from saving course settings if the other conditions for preventing changes to the proctoring_provider setting are met.

Change some tests dict order to fix assertion after python 3.7 change of preserving insertion order in dicts.

* Disable changing special exam type after release date

Do some client-side validation to make sure that exams
that *are* or *ever were* special may not be changed
to a special exam type (other than the current one)
after release date.

MST-258

Co-authored-by: Zach Hancock <zhancock@edx.org>

PROD-1506

* prevent proctoring provider changes after course start

* better comment wording

* add support email to error msg

* Add VEMPipelineIntegration config model
* Add course waffle flag to enable vem pipeline selectively

PROD-1636

Introduces the learning_sequences app, intended to provide metadata for
sequences and course outlines. The short term goal is to provide faster
source of this information for the new Courseware microfrontend
(frontend-app-learning). The medium term goal is to provide an in-proc
API that is useful to other parts of the platform that need fast access
to course outline information customized for a user. The long term
goals are outlined in the README.rst.

This first iteration of the API only lays out the basic structure for
how we'd arrange the pieces, with enough of an implementation to feel
"real" (simple schedules, staff_only content hiding). It's not ready to
be turned on, and is not currently plugged into the publish-flow. The
only way to get data into this new API is via the update_course_outline
management command. The REST endpoint is also currently limited to
global staff only, though it's possible to get the outline for a student
by using the ?username= query parameter.

TNL-7122

In a follow-up PR, this entry will be used to validate
on the client-side that a block that *is* or *ever was*
a proctored/practice/onboarding exam cannot be configured
as a different proctored/practice/onboarding exam, as that
has led to problematic exam configuration states between
edX and proctoring providers.

MST-258

PROD-1609
PROD-1610
PROD-1614
PROD-1615
PROD-1616

Fixed regex for nested pre tags

Updated import export test

fixed quality test issue

fixed No exception type(s) specified

updated tests

fixed linter issue

fixed linter issue

fixed linter issue

* Have separate column for transcript and encode status
* Display error message sent from VEM

PROD-1432

I wanted to make a byte-sized contribution but there were no Jira tickets so we decided, thanks to a conversation with @jmbowman through the Open Edx Community #incr (Slack) channel, to collaborate in the elimination of warnings listed in the Warnings Report at https://build.testeng.edx.org/job/edx-platform-python-pipeline-master/warning_5freport_5fall_2ehtml/

This PR contributes to the elimination of deprecation warnings, specifically the one mentioned above and reported in the Warnings Report.

Changed insert to insert_one in the following file:

* cms/djangoapps/contentstore/management/commands/tests/test_cleanup_assets.py

This warning occurs due to deprecation: https://api.mongodb.com/python/current/api/pymongo/collection.html#pymongo.collection.Collection.insert

I wanted to make a byte-sized contribution but there were no Jira tickets so we decided, thanks to a conversation with @jmbowman through the Open Edx Community #incr (Slack) channel, to collaborate in the elimination of warnings listed in the Warnings Report at https://build.testeng.edx.org/job/edx-platform-python-pipeline-master/warning_5freport_5fall_2ehtml/

This PR contributes to the elimination of deprecation warnings, specifically the one mentioned above and reported in the Warnings Report.

Changed assertNotRegexpMatches to assertNotRegex in the following files:

    cms/djangoapps/contentstore/views/tests/test_preview.py

    cms/djangoapps/contentstore/views/tests/test_item.py

    lms/djangoapps/commerce/tests/test_views.py

    lms/djangoapps/dashboard/tests/test_sysadmin.py

This warning occurs due to deprecation in python 3.5: https://docs.python.org/3.5/library/unittest.html#unittest.TestCase.assertNotRegex