feat: entity link view and api

[navinkarkera]

Description:

Adds api for listing upstream entity links for a given course.

Test instructions: See openedx/frontend-app-authoring#1641

Part of: openedx/frontend-app-authoring#1565
Private-ref: FAL-4006

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[pomegranited]

👍 Working beautifully.

• I tested this using the test instructions from feat: course libraries page [FC-0076] frontend-app-authoring#1641
  Also had to run migrations, recreate_upstream_links and reindex_studio to get the data ready to test.
• I read through the code that's changed since feat: upstream-downstream entity linking [FC-0076] #36111 (ref compare)
• I checked for accessibility issues N/A
• Includes documentation - code comments
• User-facing strings are extracted for translation N/A

[ChrisChV]

Looks good! I will merge it tomorrow morning

[ChrisChV]

@navinkarkera I have two question before to merge this:

• Shouldn't we also add the libraries menu to the legacy page?
  
• What should happen when the upstream link is removed? (I had this question after testing Make copied tags editable again after breaking the upstream link to library content [FC-0076] #36228)

[navinkarkera]

Shouldn't we also add the libraries menu to the legacy page?

@ChrisChV Nice catch! Added. Also, gated this page behind libraries_v2_enabled flag.

What should happen when the upstream link is removed? (I had this question after testing

We have a discussion going on in the issue here: openedx/frontend-app-authoring#1565. Since it depends on UX designs, I'll handle it in a separate task.

[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.