feat: Add units dict to index [FC-0083]

[ChrisChV]

Description

• Adds the units dict to the component search documents.
• Send CONTENT_OBJECT_ASSOCIATIONS_CHANGED signal when add/remove components in units.
• Which edX user roles will this change impact? "Developer".

Supporting information

• Github issue: Delete component that's used in a unit frontend-app-authoring#1685
• Used in: feat: New delete confirmation modal [FC-0083] frontend-app-authoring#1906
• Internal ticket: FAL-4099

Testing instructions

• Go to the library home of a library.
• Create a component and a unit
• In the unit, add the new component.
• Go to Meilisearch and verify that the component has the new units dict with the new created unit
• Remove the component from the unit
• On Meilisearch verify that the component has an empty units dict.

Deadline

ASAP

Other information

N/A

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[rpenido]

LGTM 👍
Thank you for your work, @ChrisChV!

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

[rpenido]

I would prefer a structure like

"units":  [
  { "display_name":  "Unit A", "key": "UNIT_A"},
  { "display_name":  "Unit B", "key": "UNIT_B"},
]

but it is ok to leave it as it is, to make it consistent with the "collections".

[ChrisChV]

Yes, I followed the "collections" format

[pomegranited]

I can't remember what it was, but there had to be a reason why we used that format for collections?

[ChrisChV]

I don't remember well. @navinkarkera, could you help us with that question since you implemented #35600?

[pomegranited]

Sorry, didn't mean to turn this into a thread.. it's not something we need to worry about at this moment @navinkarkera @ChrisChV 😄

[navinkarkera]

@ChrisChV Looks good! 👍

• I tested this: (verified units data in index)
• 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.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.