Finishes refactoring libraries APIs [FC-0083]

[pomegranited]

Description

Addresses libraries API TODOs introduced by #36371.

Private ref: FAL-4052

No end users are affected by this change.

Supporting information

Part of: openedx/frontend-app-authoring#1703

Testing instructions

Should be enough to do a code review and careful check of the tests to ensure they validate the desired behaviour for these new methods.

Deadline

ASAP -- want to get in before Teak cut

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[rpenido]

LGTM 👍
Thank you for your work, @pomegranited!

• I tested this by checking the API tests and navigating through the UI, checking if everything is still working fine
• I read through the code
• I checked for accessibility issues
• Includes documentation

[ChrisChV]

Looks good! I will merge it on Monday morning

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX staging environment in preparation for a release to production.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX staging environment in preparation for a release to production.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.