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.

[BD-10] Remove unused course sock URL.

[BD-10] [DEPR-68][DEPR-84] Remove pattern library of learner_dashboard/programs.py

[BD-10] [DEPR-79] Remove pattern library of mobile/course-dates-fragment.html

[BD-10] [DEPR-70] Remove waffle flag edx_discussions.use_bootstrap. 

[BD-10] [DEPR-78][DEPR-82] Remove pattern library of latest-update-fragment.html and welcome-message-fragment.html

[BD-6] Fix python 3.8 compatibility

Mergeback PR from private to public.

Sustaining xsslint security fixes

[BD-10] [DEPR-83]

Removed confirm email after SSO

Use transifex client from PyPi since required change was merged recently.

MST-234

[PROD-1230] - syncing certificates on course update on credential side.

Revert "BOM-1703 : Ora2 Upgrade"

This reverts commit f3161468.

Revert "Add demographics prompt to edx.org theme"

AA-181: Updating Outline Tab API to include Course Blocks

AA-133 mfe dates banner

- add serializer mixin to expose date banner info
- add endpoint to reset deadlines for a sepcific course

[BD-5] [BB-2503] Add 'ENABLE_ORA_USERNAMES_ON_DATA_EXPORT' feature toggle

Add demographics prompt to edx.org theme

Change switch to waffle flag.

Guard highlights against null module

Sometimes a course module will not exist and was causing exceptions
in our weekly highlights mail code. This will hopefully guard against
that a bit better.

- Add bootstrap utility function to lms-base-v1 CSS
- Moved coaching sass to edx.org theme
- Banner feature flag and MB program gated