Collections Django Admin + soft delete, hard delete, and restore

[pomegranited]

Description

Adds API methods for soft-deleting, hard-deleting and restoring Collections, and a Django Admin screen to allow superusers to hard delete any soft-deleted collections.

Supporting information

Related to: openedx/modular-learning#231
Private-ref: FAL-3809

Testing instructions

1. Using the API, create a couple collections (python manage.py shell):

   from openedx_learning.authoring import api
   learning_package = api.create_learning_package("FAL-3809", "Learning package for FAL-3809")
   api.create_collection(learning_package.id, "FAL-3809-1", title="Collection 1 for FAL-3809")
   api.create_collection(learning_package.id, "FAL-3809-2", title="Collection 2 for FAL-3809")

2. View the collection in the Django Admin: (python manage.py runserver), and ensure you can:
   • toggle the collections' "enabled" flag on and off from the list view.
   • edit the collections' title and/or description.
   • delete Collection 1 using Django Admin
3. Using the API, soft-delete, restore, and delete a collection (python manage.py shell):

   from openedx_learning.authoring import api
   collection = api.get_collection("FAL-3809", "FAL-3809-2")
   assert collection.enabled
   # Soft delete
   collection = api.delete_collection("FAL-3809", "FAL-3809-2")
   assert not collection.enabled
   # Restore
   collection = api.restore_collection("FAL-3809", "FAL-3809-2")
   assert collection.enabled
   # Hard delete
   collection = api.delete_collection("FAL-3809", "FAL-3809-2", hard_delete=True)
   assert not collection.id
   

Deadline

ASAP

[openedx-webhooks]

Thanks for the pull request, @pomegranited!

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