fix: mark container as ready to sync if any child block is deleted [FC-0112]

[navinkarkera]

Description

Fixes the issue where a container was not displayed as ready to sync when a descendent component is deleted in library

Useful information to include:

• Which edX user roles will this change impact? "Course Author"

Supporting information

• Descendant deletion sync bugs frontend-app-authoring#2562
• Private-ref: https://tasks.opencraft.com/browse/FAL-4270

Testing instructions

Verify that the bug described in https://tasks.opencraft.com/browse/FAL-4270 is fixed.

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[ChrisChV]

Looks good! I will wait for the review of @rpenido to merge

[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

This is ready for merge @ChrisChV!

[ChrisChV]

@navinkarkera could you squash this to fix the broken coverage?