* 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

fix: bump edx-ace to 1.0.1 to fix braze email styling

MICROBA-1011 | Reduce use of Certificates models accessed directly in Instructor Dashboard djangoapp

[MICROBA-1011]
- When creating bulk allowlist entries make the tool use the `is_on_allowlist` certificate API function over accessing the CertificateWhitelist model methods directly
- When creating bulk allowlist entries make the tool use the `create_or_update_allowlist_entry` certificate API function over using CertificateWhitelist model/Django ORM directly

[AA-461] Add management command to export course metadata for all courses

Allowing it to do so left us prone to error when an explicit enterprise_customer_uuid arg is provided.
We should modify this command in the future to perform deletions of open assignments as its only action,
and it should only be invoked this way after we have verified that all
backfilled enterprise_customer fields on the assignments have been set correctly.
enterprise version 3.18.4

Improved error handling in Course Outline generation.

MICROBA-1011 | Remove duplicate allowlist entries and add constraint preventing future occurrences

A "section" tag in an OLX upload used to map to the
SemanticSectionDescriptor, which translated it into a Sequence
("sequential" tag). This is both obscure and confusing, since it uses
language that predates Studio. Back in the LMS prototype days,
"section" was inconsistently used to be interchangeable with "sequence"
and "sequential", and what Studio today calls a "section" was called a
"chapter". Bits of this legacy terminology are still around in the
courseware rendering code.

The upshot is that if you make an OLX tag "section" before this commit,
it would not map to what we call a "Section" in all our documentation,
but to a "Subsection"; furthermore, if that <section> only had one child
element, the node would be replaced with its singular child, removing
the <section> node from the course tree entirely.

The fact that you can make a "section" OLX tag
at all is nowhere in our documentation because courses haven't bee...

disable xsslint

* Introduces the idea of content errors into the learning_sequences
  public API, accessible using get_content_errors().
* Makes course outline generation much more resilient to unusual
  structures (e.g. Section -> Unit with no Sequence in between),
  with the understanding that anything that doesn't conform to the
  standard structure will simply be skipped.
* Improves the Django Admin for learning_sequences to display
  content errors and improve sequence data browsing within a course.
* Switches the main table viewed in the Django admin from
  LearningContext to CourseContext, which is appropriate since only
  course runs generate outlines.

This was done as part of TNL-8057, with the end goal of making
course outline generation resilient enough to switch over apps
to using the learning_sequences outline API. The types of course
structure errors that this PR addresses cause display issues even
in the current Outline Page experience, but would break the outline
generation for learning_sequences altogether.

The approach for error messages here is very generic, to keep
modulestore concepts from seeping into learning_sequences (which is
not aware of the modulestore/contentstore). We may need to address
this later, with a more normalized content error data model.

While the Django admin page is backwards compatible with the old
versions of the models, we should run the backfill_course_outlines
management command after deploying this change, to get the full
benefits.

Adding new functionality is going to require running this command
on all courses, not just ones that have it missing.

* fix: six was being used without being imported

Removed usage of the python library six from module. This is fixing an error where the python library six is used in a module without being imported. Multiple PRs merging around same time caused this conflict.

replace six with str

MICROBA-1011 | Remove duplicate allowlist entries and add constraint to model to prevent future occurrences

[MICROBA-1011]
- Add data migration to remove the duplicate certificate allowlist entries before adding the new constraint to the CertificateWhitelist model.
- Add `unique_together` constraint to the CertificateWhitelist model. A learner should only have a single allowlist entry per course-run.

Added custom for SSO auth entries to monitor which auth entries are
still in use.

AA-213: create progress tab mfe waffle flag

The Learning MFE had a bug where instructors selecting
'View As: Audit' would find themselves redirected to the
'Enroll Now' page. This was because the Courseware API,
 which powers the MFE, checked courseware access *after*
setting up masquerading--so, instead of checking whether
the instructor had access to view the course, we checked
whether some arbitrary un-enrolled learner would have
access to the course (the answer is generally No).

We fix this by doing what the Legacy courseware index
does: calculate courseware access *before* setting up
masquerading.

TNL-7989

feat: update to edx-ace 1.0.0

The new version switches how you specify recipients, to use
lms_user_id instead of usernames.

AA-489