feat!: Switch v2 libraries to Learning Core data models (#34066)

This moves the Content Libraries V2 backend from Blockstore [1] over to
Learning Core [2] For high-level overview and rationale of this move, see
the Blockstore DEPR [3]. There are several follow-up tasks [4], most notably
adding support for static assets in libraries.

BREAKING CHANGE: Existing V2 libraries, backed by Blockstore, will stop
working. They will continue to be listed in Studio, but their content
will be unavailable. They need to be deleted (via Django admin) or manually
migrated to Learning Core. We do not expect production sites to be in
this situation, as the feature has never left "experimental" status.

[1] https://github.com/openedx-unsupported/blockstore
[2] https://github.com/openedx/openedx-learning/
[3] https://github.com/openedx/public-engineering/issues/238
[4] https://github.com/openedx/edx-platform/issues/34283

cms/djangoapps/contentstore/management/commands/backfill_orgs_and_org_courses.py

@@ -273,9 +273,9 @@ def find_orgslug_libraryid_pairs() -> Set[Tuple[str, str]]:
 
     Note that this only considers "version 1" (aka "legacy" or "modulestore-based")
     content libraries.
-    We do not consider "version 2" (aka "blockstore-based") content libraries,
-    because those require a database-level link to their authoring organization,
-    and thus would not need backfilling via this command.
+    We do not consider "version 2" content libraries, because those require a
+    database-level link to their authoring organization, and thus would not need
+    backfilling via this command.
 
     Returns: set[tuple[str, str]]
     """

cms/djangoapps/contentstore/tasks.py

@@ -922,15 +922,14 @@ def _create_metadata(v1_library_key, collection_uuid):
     library_license = ''  # '' = ALL_RIGHTS_RESERVED
     with atomic():
         return v2contentlib_api.create_library(
-            collection,
-            library_type,
             org,
             slug,
             title,
             description,
             allow_public_learning,
             allow_public_read,
-            library_license
+            library_license,
+            library_type,
         )
 
 

cms/djangoapps/contentstore/views/tests/test_clipboard_paste.py

@@ -4,7 +4,6 @@ allow users to paste XBlocks that were copied using the staged_content/clipboard
 APIs.
 """
 import ddt
-from django.test import LiveServerTestCase
 from opaque_keys.edx.keys import UsageKey
 from rest_framework.test import APIClient
 from organizations.models import Organization
@@ -13,9 +12,7 @@ from xmodule.modulestore.tests.django_utils import ModuleStoreTestCase, upload_f
 from xmodule.modulestore.tests.factories import BlockFactory, CourseFactory, ToyCourseFactory
 
 from cms.djangoapps.contentstore.utils import reverse_usage_url
-from openedx.core.lib.blockstore_api.tests.base import BlockstoreAppTestMixin
 from openedx.core.djangoapps.content_libraries import api as library_api
-from blockstore.apps import api as blockstore_api
 
 CLIPBOARD_ENDPOINT = "/api/content-staging/v1/clipboard/"
 XBLOCK_ENDPOINT = "/xblock/"
@@ -214,7 +211,7 @@ class ClipboardPasteTestCase(ModuleStoreTestCase):
         assert source_pic2_hash != dest_pic2_hash  # Because there was a conflict, this file was unchanged.
 
 
-class ClipboardLibraryContentPasteTestCase(BlockstoreAppTestMixin, LiveServerTestCase, ModuleStoreTestCase):
+class ClipboardLibraryContentPasteTestCase(ModuleStoreTestCase):
     """
     Test Clipboard Paste functionality with library content
     """
@@ -229,7 +226,6 @@ class ClipboardLibraryContentPasteTestCase(BlockstoreAppTestMixin, LiveServerTes
         self.store = modulestore()
         # Create a content library:
         library = library_api.create_library(
-            collection_uuid=blockstore_api.create_collection("Collection").uuid,
             library_type=library_api.COMPLEX,
             org=Organization.objects.create(name="Test Org", short_name="CL-TEST"),
             slug="lib",