Full platform tests - output detail schema

[metalwarrior665]

Implement tests (or update current ones) that will check all output fields for their schema values. Check different output types (also from miniactors if needed) - e.g. profiles, posts, comments, details, etc.

Our OKR is to cover 80% use-cases but let's try to get closer to 100% :)

More details on how we want to structure tests: https://www.notion.so/apify/Tests-revamp-2024-Q1-2-b411bbfbf7e74af6a5f24fb36fe68332

In the future, we plan to export schema from the code itself into tests so we will have a single source of truth for validation but we will not wait for this feature yet.