feat: api to bulk update legacy library references

[navinkarkera]

Description

Adds API to fetch all legacy library content blocks that are ready to be updated to use library v2 and convert to item banks.
Also adds API to update all the references via a user celery task and to fetch its status.

Useful information to include:

• Which edX user roles will this change impact? "Developer".

Supporting information

• Bulk migrate LegacyLibraryContent Block references frontend-app-authoring#2758
• Related frontend PR: feat: bulk update legacy library references frontend-app-authoring#2764
• Private-ref: https://tasks.opencraft.com/browse/FAL-4310

Testing instructions

See openedx/frontend-app-authoring#2764

Deadline

"None" if there's no rush, or provide a specific date or event (and reason) if there is one.

Other information

Include anything else that will help reviewers and consumers understand the change.

• Does this change depend on other changes elsewhere?
• Any special concerns or limitations? For example: deprecations, migrations, security, or accessibility.
• If your database migration can't be rolled back easily.

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[rpenido]

LGTM 👍
Thank you for your work, @navinkarkera!

• I tested this using the instructions from the PR
• I read through the code
• I checked for accessibility issues
• Includes documentation

[ChrisChV]

The code looks good, thanks!