feat!: Remove Unused Libraries v2 Import API & LTI Tool (#38297)

This removes two unused content_libraries features. Both were
developed during the ~2021 pre-alpha Blockstore Libraries days.
They were ostensibly ported during the Blockstore->Core
transition but they were untested and probably do not work any more.
We're removing them now to avoid bringing them along for any more re-
factorings. The features:

* The LTI 1.3 Provider Tool, which exposed library blocks via LTI, developed
  originally for a HarvardX use case.
* The Course Import API. This was developed by 2U in attempt to
  move course content into V2 libraries, but only developers used it.
  Please note that this is not the same as the Course Import feature which we
  are building for Verawood--that is built on the modulestore_migrator API.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: kdmccormick

cms/envs/common.py

@@ -121,16 +121,6 @@
 # only supported in courses using split mongo.
 ENABLE_CONTENT_LIBRARIES = True
 
-# .. toggle_name: settings.ENABLE_CONTENT_LIBRARIES_LTI_TOOL
-# .. toggle_implementation: DjangoSetting
-# .. toggle_default: False
-# .. toggle_description: When set to True, Content Libraries in
-#    Studio can be used as an LTI 1.3 tool by external LTI platforms.
-# .. toggle_use_cases: open_edx
-# .. toggle_creation_date: 2021-08-17
-# .. toggle_tickets: https://github.com/openedx/edx-platform/pull/27411
-ENABLE_CONTENT_LIBRARIES_LTI_TOOL = False
-
 # Toggle course entrance exams feature
 ENTRANCE_EXAMS = False
 
@@ -320,7 +310,6 @@ def make_lms_template_path(settings):
 
 # use the ratelimit backend to prevent brute force attacks
 AUTHENTICATION_BACKENDS.insert(0, 'auth_backends.backends.EdXOAuth2')
-AUTHENTICATION_BACKENDS.insert(2, 'openedx.core.djangoapps.content_libraries.auth.LtiAuthenticationBackend')
 
 LMS_BASE = None
 

cms/envs/mock.yml

@@ -398,7 +398,6 @@ FEATURES:
   ENABLE_API_DOCS: true
   ENABLE_ASYNC_ANSWER_DISTRIBUTION: true
   ENABLE_COMBINED_LOGIN_REGISTRATION: true
-  ENABLE_CONTENT_LIBRARIES_LTI_TOOL: true
   ENABLE_CORS_HEADERS: true
   ENABLE_COUNTRY_ACCESS: true
   ENABLE_COURSEWARE_INDEX: true

openedx/core/djangoapps/content_libraries/api/__init__.py

@@ -7,6 +7,5 @@
 from .collections import *
 from .container_metadata import *
 from .containers import *
-from .courseware_import import *
 from .exceptions import *
 from .libraries import *