If the library content block is already in the course, then don't
refresh the children when we re-import it. This lets us address
TNL-7507 (Randomized Content Block Settings Lost in Course Import)
while still avoiding AA-310, where the IDs of the children for an
existing library_content block might be altered, losing student
user state.

When importing, we only copy the default values from content
in a library the first time that library_content block is created.
Future imports ignore what's in the library so as not to disrupt
course state. You can still update to the library via the Studio
UI for updating to the latest version of a library for this block.

A major update to this function allows it to actually autofill the
certificate information again! I believe LinkedIn changed their API
and we never updated our end. This fixes that!

Removed most of the deprecated shoppingcart app, leaving just enough to allow us to cleanly remove the related database tables later. Also removed the relevant Django settings that weren't in use elsewhere.

This is used in this commit to check if a timed exam contains any problems that have been gated by content type gating
REV-1510

In case of login micro frontend redirection lms
domain added in redirection url.

VAN-71

* EDUCATOR-5304 - update help text

* EDUCATOR-5304 - update help text - escape underscore

* EDUCATOR-5304 - update help text - escape underscore 2

The previous attempt to implement this was bugged because it was not respecting manual exceptions to content type gating. This is fixed by checking has_access for each child problem of the sequence.
REV-1510

Revert "Revert "[REV-774] Show content type gating upsell when a limited access learner tries to access a timed exam""

Until now only `%%USER_ID%%` was supported. This adds a new keyword that can be used inside an HTML block.

Re-applied bugfix #24214, but behind a waffle flag. The change gates timed exams for audit learners. We would like to limit access to timed exams to verified learners. However, some of the instructors would like to make their content free for all users, including graded content/timed exams (hence the Feature-Based Enrollment "FBE" exemption). As a result, we will be rolling the gated timed exams functionality out behind a waffle flag now, add the FBE exemption when we figure out how, and gradually turn the waffle flag on for everyone.

Bokchoy testing database update

Revert "Revert "ARCHBOM-1494: Refer to custom attributes, not metrics, especially with edx-django-utils (#25010)" (#25025)" (#25055)

This reverts commit 986a448d.