For legacy library_content references in courses, this PR:
- **Removes the spurious sync after updating a reference to a migrated
library**, so that users don't need to "update" their content _after_
updating their reference, _unless_ there were real content edits that
happened since they last synced. We do this by correctly associating a
DraftChangeLogRecord with the ModulestoreBlockSource migration artifact,
and then comparing that version information before offering a sync.
(related issue:
https://github.com/openedx/frontend-app-authoring/issues/2626).
- **Prompts users to update a reference to a migrated library with higher
priority than prompting them to sync legacy content updates for that
reference**, so that users don't end up needing to accept legacy content
updates in order to get a to a point where they can update to V2 content.
- **Ensures the library references in courses always follow the correct
migration,** as defined by the data `forwarded` fields in the data model,
which are populated based on the REST API spec and the stated product UI
requirements.
* For the migration itself, this PR:
- **Allows non-admins to migrate libraries**, fixing:
https://github.com/openedx/edx-platform/issues/37774
- **When triggered via the UI, ensures the migration uses nice title-based
target slugs instead of ugly source-hash-based slugs.** We've had this as an
option for a long time, but preserve_url_slugs defaulted to True instead of
False in the REST API serializer, so we weren't taking advantage of it.
- **Unifies logic between single-source and bulk migration**. These were
implement as two separate code paths, with drift in their implementations. In
particular, the collection update-vs-create-new logic was completely
different for single-souce vs. bulk.
- **When using the Skip or Update strategies for repeats, it consistently
follows mappings established by the latest successful migration** rather than
following mappings across arbitrary previous migrations.
- **We log unexpected exceptions more often**, although there is so much more
room for improvement here.
- **Adds more validation to the REST API** so that client mistakes more often
become 400s with validation messages rather than 500s.
For developers, this PR:
- Adds unit tests to the REST API
- Ensures that all migration business logic now goes through a general-purpose
Python API.
- Ensures that the data model (specifically `forwarded`, and
`change_log_record`) is now populated and respected.
- Adds more type annotations.
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