feat: update content libraries API to use events from openedx-core [FC-0117]

[bradenmacdonald]

Description

With openedx/openedx-core#543, openedx-core now emits events when changes happen within a Learning Package.

This PR updates the content libraries code and search code accordingly. The main benefit is that the search index now stays up to date regardless of which APIs are used. We don't need to "wrap" some low-level APIs in high-level APIs just to add events.

Note: The "Library Collections" code was already working fine because it used Django signals to watch for changes to the Collection-PublishableEntity many-to-many relationship, but it shouldn't have been so aware of the internals of openedx_content.

Supporting information

See openedx/openedx-core#462

Testing instructions

TODO

Deadline

Verawood

Other information

Depends on openedx/openedx-core#543 . But at the moment, you'll also have to revert the changes from Kyle's latest PRs on openedx-core main, because edx-platform isn't yet compatible with them.

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