[AA-461] Call celery task directly from management command instead of calling the signal

AA-461

Enable course cert sync for all courses

Removes waffle flag restriction for syncing certificate available dates
to the credentials service.

add traits to segment context for enrollment activated events

fix: enterprise 3.18.6 | The update_role_assignments_with_customers command no longer updates records.  It only creates new records, which helps de-risk the operation.

I had the wrong attribute before this commit, and Django Admin let
me get away with it because it doesn't explode when you try to grab
relations that aren't there–it just quietly returns None in some of
those cases.

feat: mark forum response notifications transactional

The user opts into them when making a post / through the forums UI.
They are not truly a marketing email or similar.

pyupgrade in leaner-profile, lti-course-tab, personalized-learner 

feat: Pass date in cert date update signal

pyupgrade in course-search and discount.

pyupgrade in announcements. 

Ran pyupgrade on openedx/core/djangoapps/{coursegraph, courseware_api, crawlers}

* Added a pylint plugin to set django settings module according to the module on which pylint is ran

* Fix quality

Co-authored-by: Awais Qureshi <awais.qureshi@arbisoft.com>

BOM-2453

AA-212: add masquerade test for progress tab

The render_xblock view, which powers the Learning
MFE (among other things) returned a 404 when un-
enrolled course staff users tried to load it while
masquerading as learners. This was because we
checked course access after enabling the
masquerading context, which triggered a redirect-
to-enrollment exception.

The fix is simply to enable the masquerading
context after checking course access.
Content-level behavior and access is still
calculated within the masquerading context,
as intended.

TNL-7989

tests are failings and complaining related objects doest not exists in
User table. Create object in test setup to fix it.
In another fix article id was giving integrity error.
Fixing task test.

fix: don't duplicate text in forum notification email

tests are failings and complaining related objects doest not exists in User table. Create object in test setup to fix it.
In another fix article id was giving integrity error.
Fixing task test.

Exposed the Date header so clients can accurately compute times relative to the dates returned by the API; browser time is notoriously unreliable for this, especially for a Learner-facing countdown call-to-action based on the access expiration date. (REV-2126)

Using the Date header for this allows the client to make use of information that is already sent, does not require additional calls nor modifying the API, and could be generalized to more or all our APIs without modifying them.

MICROBA-1011 | Reduce use of certs models directly in instructor dashboard app