fix: video_config runtime service added when loading for xBlock (#37900)

Adding transcripts to Videos now goes through the new VideoConfigService
instead of direct calls from the VideoBlock. However, the VideoConfigService
was not added to Studio. This patch fixes transcript uploading by adding
the service to Studio.

cms/djangoapps/contentstore/utils.py

@@ -27,6 +27,7 @@ from milestones import api as milestones_api
 from opaque_keys import InvalidKeyError
 from opaque_keys.edx.keys import CourseKey, UsageKey, UsageKeyV2
 from opaque_keys.edx.locator import BlockUsageLocator, LibraryContainerLocator, LibraryLocator
+from openedx.core.djangoapps.video_config.services import VideoConfigService
 from openedx_events.content_authoring.data import DuplicatedXBlockData
 from openedx_events.content_authoring.signals import XBLOCK_DUPLICATED
 from openedx_events.learning.data import CourseNotificationData
@@ -1314,7 +1315,8 @@ def load_services_for_studio(runtime, user):
         "settings": SettingsService(),
         "lti-configuration": ConfigurationService(CourseAllowPIISharingInLTIFlag),
         "teams_configuration": TeamsConfigurationService(),
-        "library_tools": LegacyLibraryToolsService(modulestore(), user.id)
+        "library_tools": LegacyLibraryToolsService(modulestore(), user.id),
+        "video_config": VideoConfigService(),
     }
 
     runtime._services.update(services)  # lint-amnesty, pylint: disable=protected-access