LEARNER-4428

Used to support setting up whitelabel end-to-end courses in devstack.

If the Publisher endpoint is only making seats, don't require a UUID for
the course.

ENT-890

When creating course products, expect to be given the course UUID.
This way we don't have to look it up from discovery, which is the
one telling us about the products in the first place.

Allow creating entitlement products via the AtomicPublication API.
Just pass them in like normal seat products, with an entitlement
product class instead of a seat class.

And remove the unused /products create endpoint (that had been
intended to support this workflow, but it's not atomic, so we'll
keep using the generic publication endpoint with new support for
entitlements and drop the unused create-one-entitlement endpoint).

This reverts commit fc824bf7 which was
itself a reversion to back out these changes while we fixed our staging
services.

LEARNER-3891

This reverts commit d7e83538.

Allow creating entitlement products via the AtomicPublication API.
Just pass them in like normal seat products, with an entitlement
product class instead of a seat class.

And remove the unused /products create endpoint (that had been
intended to support this workflow, but it's not atomic, so we'll
keep using the generic publication endpoint with new support for
entitlements and drop the unused create-one-entitlement endpoint).

LEARNER-3891

This reverts commit 42654f93.

LEARNER-3466

More details in FEDX-500

LEARNER-1306

LEARNER-2634

Learner-3936

LEARNER-3528

WE No longer using the django history tables so the purpose of
this PR is to add migrations that will eventually delete history tables
LEARNER-3349

LEARNER-3527

LEARNER-3634

This will skip any ecommerce-related pages for users who are attempting
to enroll in a course/program which has a 100% discount due to an
Enterprise offer and redirect the user to the appropriate LMS page.

This reverts commit 51e794926c354a938c7353594530548e86b1d712.

LEARNER-3013

The list of EnterpriseCustomers in the system is getting long. This
is a stopgap solution to making the drop down list more usable.