Use a bulk context when pasting containers into a content library

[bradenmacdonald]

Description

Fixes #38507

Now, when pasting a container into a library:

• Only a single draft change log is created, regardless of how many "things" are in the container, and
• The change is properly attributed to the current user who pressed "paste"

Testing instructions

1. Copy a unit (or subsection, etc.) from a course and paste it into a library.

2. Go to http://studio.local.openedx.io:8001/admin/openedx_content/draftchangelog/ and verify that only a single draft changelog was created. Verify that it shows "Changed by: (your username)".

The username can also be checked from the UI:

Deadline

We want to backport it to Verawood.

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