Remove the additional search views flag

[obulat]

Fixes

Fixes #3918 by @obulat

Description

This PR removes the flag from the Nuxt app.

It also removes the old snapshots. I didn't rename the single result snapshots (removing -with-additional-search-views) here to make it easier to review. We can rename them in a small follow-up PR.

Testing Instructions

The CI should pass, single result, collection and sources pages should work as expected. The flag should not be displayed on the /preferences page

Checklist

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[github-actions]

Full-stack documentation: https://docs.openverse.org/_preview/4222

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[obulat]

I don't know how, but it seems that the sensitive tests are changing the state for other tests, and make them add mature=true to requests. To prevent that, we always set fetch_sensitive to false if no features are passed here.

[zackkrida]

Can you make an issue for this?

[dhruvkb]

Nice to see so many unused code branches removed. LGTM!

[zackkrida]

LGTM!