feat: update meilisearch configuration needed for tags filter [FC-0040]

[bradenmacdonald]

Description

This updates the Meilisearch configuration during index building, so that we can use the "facet search" API on the tags content.

Without this change, we cannot properly get the list of tags to filter by in the (beta) Studio Content Search:

But with this change in place, we can:

Supporting information

Part of openedx/modular-learning#201

This only affects instances that have the MEILISEARCH_ENABLED flag on (default is off).

Testing instructions

To test this, you need to use openedx/frontend-app-authoring#945

Deadline

Neeeded for Redwood, so ASAP

Private ref: FAL-3704

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[bradenmacdonald]

@rpenido This PR is ready - could you please review it?

[rpenido]

Hi @bradenmacdonald ! LGTM 👍

• I tested this on my tutor dev stack using the PR test instructions
• I read through the code
• Includes documentation

Also, I added these changes (66b1b71) in the other PR (#34391) in case you merge it first.

[bradenmacdonald]

Closing - this was included in another PR ^

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