Description

Refactors coverage tests similarly as done for others in #5600. The current coverage tests are a bit of mess.

Most coverage tests will need a way to change coverage options and verify the output. For this we'll need to use Vitest Node APIs. Vitest Workspaces is used to change coverage providers and browser mode. Tests themselves configure different coverage options that are being tested.

Includes fix from #5954 so let's merge that one first.

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