Upgrade uses renamed enterprise catalog endpoints

Also pinned httpretty < 1.0 because that upgrade broke many tests.

This is an unused-as-of-yet utility function to generate a bunch
of ics files for a user's course schedule. Will be used as part
of the calendar_sync feature package.

AA-37

checking django-wiki and fixing deprecation warnings.

We upgraded these before in https://github.com/edx/edx-platform/pull/23119 along with django-countries (which released a new version just before that), but had to revert in https://github.com/edx/edx-platform/pull/23237 because of a performance regression in the admin page for EnterpriseCustomer.  We think django-countries was the culprit and have pinned it, so trying these two again by themselves.

- switches to openedx-calc from PyPI
- includes edx-rest-api-client major upgrade.

ARCHBOM-952

Pulling in changes to try and fix JSONField formatting in django admin.

ENT-2677

-Upgrade edx-drf-extensions
-settings-update

This partially reverts #23318.