fix: verify type when fetching associations fields

[Paul-Bob]

Description

Fixes #3166
Fixes #3158

In the previous attempt #3230, I aimed to target the exact field type when fetching association fields. However, that approach was abandoned as it led down a rabbit hole and was difficult to stabilize. In some cases, identifying the exact field type would require passing it through params, which is not ideal for maintainability and simplicity.

This PR simplifies things by following the 80/20 rule. Instead of trying to pinpoint the exact field type, Avo now just checks if the field is one of the supported associations when fetching fields. This fixes the reported issue and similar ones without overcomplicating things.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

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This PR has been merged into main. The functionality will be available in the next release.

Please check the release guide for more information.