feat: Add REST endpoints to update Components in a Collections [FC-0062]

[pomegranited]

Description

Adds a REST endpoint (patch, delete) for updating the Components in a v2 Content Library's Collection.
Adding/removing components raises a CONTENT_OBJECT_TAGS_CHANGED event, because we will index the ContentObject's collections as a type of "tag".

Note: We'll be renaming CONTENT_OBJECT_TAGS_CHANGED to CONTENT_OBJECT_ASSOCIATIONS_CHANGED as part of openedx/modular-learning#230

This PR adds to the features available to Course Authors of v2 Libraries, which aren't recommended for production use yet.

Supporting information

Part of : openedx/modular-learning#227
Based on: #35321
Depends on:

• Associate PublishableEntities with Collections [FC-0062] openedx-learning#216
• feat: Add Content Library Collections signals [FC-0062] openedx-events#386

Private-ref: FAL-3784

Testing instructions

Please check that the unit tests added here cover most cases.

Manual testing:

1. Checkout this branch in your local dev environment
2. Make sure you have feat: Add Content Library Collections signals [FC-0062] openedx-events#386 and Associate PublishableEntities with Collections [FC-0062] openedx-learning#216 installed and running locally
3. Create a V2 library, e.g lib:SampleTaxonomyOrg1:AL1
4. Add some blocks to that library.
5. In an external HTTP client (like curl/postman or similar) make the following requests (make sure you have the correct headers for authentication, you can copy them from the network tab in your browser), replace the library key in the URL with your actual library key:
   1. POST http://studio.local.edly.io:8001/api/libraries/v2/lib:SampleTaxonomyOrg1:AL1/collections/
      1. Payload: {"title":"Collection 1", "description": "First Collection"}
      2. This should return the newly created collection; note the ID and modified dates.
   2. GET http://studio.local.edly.io:8001/api/libraries/v2/lib:SampleTaxonomyOrg1:AL1/blocks/
      1. Should return the list of blocks added to this library
      2. Note their usage key values for the steps below.
   3. PATCH http://studio.local.edly.io:8001/api/libraries/v2/lib:SampleTaxonomyOrg1:AL1/collections/1/contents/
      1. Payload: {"usage_keys": [ <list of usage keys from the library blocks> ]
      2. Should return {"count": <number of components in list>}
      3. Check the logs and confirm that the event was emitted for each component, triggering an "upsert" into Meilisearch.
   4. GET http://studio.local.edly.io:8001/api/libraries/v2/lib:SampleTaxonomyOrg1:AL1/collections/1/
      1. The modified timestamp should be updated.
   5. DELETE http://studio.local.edly.io:8001/api/libraries/v2/lib:SampleTaxonomyOrg1:AL1/collections/1/contents/
      1. Payload: {"usage_keys": [ <list of usage keys from the library blocks> ]
      2. Should return {"count": <number of components in list>}
      3. Check the logs and confirm that the event was emitted for each component, triggering an "upsert" into Meilisearch.
   6. GET http://studio.local.edly.io:8001/api/libraries/v2/lib:SampleTaxonomyOrg1:AL1/collections/1/
      1. The modified timestamp should be updated.
   7. GET http://studio.local.edly.io:8001/api/libraries/v2/lib:SampleTaxonomyOrg1:AL1/collections/1/contents/ - will raise a 405, as an object's collections will be fetched from Meilisearch.

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[pomegranited]

FIXME: update when openedx/openedx-learning#216 merged & tagged.

[pomegranited]

Merged into #35321 for CC review.

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