chore: fix failing tests and skip some

[ematipico]

Changes

This PR does the following:

• fixes a bunch of issues caused by the content collection tests. The .clean() function that was called in the after hook is async, but it was called without an await causing all the next test cases to fail the build because a clean up was in progress cc @florian-lefebvre
• there were some issues in some other tests. I will have to ping people internally to figure out why the are failing now. The hydration test seems legitimate. The errors test is weird, I wonder if it's some kind of regression cc @lilnasy

Testing

The CI should pass

Docs

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[ematipico]

I am going to merge this because I still have work to do, and I need this PR. Feel free to add any comments for context.