feat: post message on preview library block changes

[navinkarkera]

Description

Posts message with library xblock changes info instead of displaying a modal if the unit is rendered in an iframe.

Depends on #35693 Merged.

Supporting information

• Update workflow for library-sourced content (Authoring MFE - Unit Page) frontend-app-authoring#1464
• feat: preview library block changes in course unit [FC-0062] frontend-app-authoring#1506

Testing instructions

Follow instructions in openedx/frontend-app-authoring#1506

[openedx-webhooks]

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[rpenido]

LGTM 👍
Thank you for your work, @navinkarkera!

• I tested this using the instructions from openedx/frontend-app-authoring#1506
• I read through the code
• I checked for accessibility issues
• Includes documentation

[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.