- Adds Units, Subsection, and section cards in the libraries sync page.
- Rename of `mockGetEntityLinks` to `mockGetComponentEntityLinks`
- Use the top-level parent logic
- Which user roles will this change impact? "Course Author".
Fixes issues related to component libraries' review/sync flow
* Inconsistent sync pane title versions
* Library content shown in preview warning only appears in review changes modal when that modal is opened from the review tab
* Some new changes only appear within library review tab on scroll at top of list
* Vertically misaligned sync icon in review changes message on course outline
* Show available updates whenever content is updated, regardless of number of updates available
