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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