Fix dynamically excluded providers caching

[obulat]

Fixes

Fixes #3380 by @obulat

Description

This PR saves a list of provider_identifiers for the dynamically-excluded providers to the redis cache, instead of saving the QuerySet.
It also adds two unit tests for the specific functions, but there are also several other tests that test dynamically excluded providers using both cache and the ContentProvider model saved in the database.

Testing Instructions

Run the app, go to http://localhost:50280/admin, select one of the ContentProvider models and check its "Hide Content" property.

Execute a search (http://localhost:50280/v1/images). Check Redis value for :1:filtered_providers (I used the RedisInsights GUI):

Also, check that on main, if you set "Hide content" to true for one of the providers, the value saved in Redis should look like the one in the related issue instead of a list of filtered providers.

Checklist

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• I ran the DAG documentation generator (if applicable).

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[AetherUnbound]

Excellent find, and thank you for also improving the tests and documentation!

[sarayourfriend]

LGTM!

[krysal]

Well seen! LGTM!

[krysal]

This could be replaced with the new FILTERED_PROVIDERS_CACHE_KEY constant from api.controllers.search_controller.

[krysal]

And the same here!

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ TypeError: string indices must be integers, not 'str' /v1/audio/{identifier}/related/ View Issue

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