[AA-461] Change course metadata export to be a celery task

Centralize the logic for choosing between
MFE and Legacy-frontend courseware within
three new functions:
* courseware_mfe_is_active
* courseware_mfe_is_visible
* courseware_legacy_is_visible

This allows us to create another new function:
* get_courseware_url
which can be called anywhere in LMS/Studio
to get the canonical URL to courseware
content (whether it be MFE or Legacy).

In future commits we we begin using
get_courseware_url throughout the platform.

TNL-7796

feat: Changed username max_length to the specified by django

The terraform policy for the export is already attached to the worker role
AA-461

feat: Upgrade edx-enterprise to 3.17.48 | Adds a mgmt command to update all SystemWideEnterpriseUserRoleAssignment records in a way that makes them more explicitly defined.  ENT-4099.

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

Upgrade edx-proctoring to 3.7.8

The docs configuration files previously had to account
for the fact that lms/djangoapps, cms/djangoapps, and
common/djangoapps were hacked into sys.path. As of ~Lilac,
this is no longer the case.

Unrelated cleanup: devstack_docker and devstack
are now aliases, so we can simplify a conditional import
in docs_settings.py

The timeline of the import_shims removal has evolved
over time; notably, we are keeping the import_shims
in Lilac in order to make any lingering old-style
import paths obvious to operators.

Update the ADR to reflect this. Also, add a table
mapping old import paths to new ones.

Previously, deprecated [lms|cms|common]/djangoapps
import paths would only raise errors if the
ERROR_ON_DEPRECATED_EDX_PLATFORM_IMPORTS
flag, which defaulted to False (but is overriden
to True for Devstack and *.edx.org), was enabled.

This change removes that setting and always raises
on use those deprecated import paths.

Changes the LMS/Studio bundle cache key,
thus invalidating all 47hr-TTL entries
in favor of new 50min-TTL entries.

TNL-7771

Add option to disable the help link in the navbar

When we tried upgrading Jenkins workers from Ubuntu 16.04 to 20.04, `diff-cover` started silently failing with a return code of `1`.  We suspect this is due to https://github.com/Bachmann1234/diff_cover/issues/153 , so we're adding the workaround described in that ticket.

datetimestamp added for account activation event

Fix URL in forum notification post.

S3 URLs served by Blockstore have a max TTL of
1hr, since the temporary credentials the Blockstore
uses to sign the URLs themselves have a TTL of
1hr. Thus, we must cache Blockstore bundles for
less than 1hr.

TNL-7771

Run Pyupgrade on pipeline mako.

Run Pyupgrade on terrain

[AA-461] Add temporary debugging logs to determine why the highlights export is not working

urljoin('my.domain.com', '/my/path') returns '/my/path'. We have to make
sure to use the full base url (starting with http(s)://) and not just
the site's domain.

VAN-390

feat: This upgrades the version of edx-proctoring library to 3.7.6. This includes a fix to a bug that prevented course staff members from marking proctored exam attempts as ready_to_resume. The bug was that the course ID was being incorrectly determined by the StudentProctoredExamAttempt PUT handler. (#26880)

django-not-configured is an error raised by pylint (with
the pylint-django plugin) when it's not correctly configured.

We should not be applying lint amnesty for such a violation.

MICROBA-1038 | Don't check enrollment status when removing allowlist entries

Run Pyupgrade on course-action-state.

[AA-461] Export highlights to s3 for use by braze

* pyupgrade on contentstore/views

* Apply suggestions from code review

Co-authored-by: Usama Sadiq <usama.sadiq@arbisoft.com>

Co-authored-by: Usama Sadiq <usama.sadiq@arbisoft.com>

[TSD] Added annotations for ENABLE_ANNOUNCEMENTS feature flag