improve vitest hang

[Irev-Dev]

We have an ongoing intermittent and hard to track down issue with vitests hanging

I did not realise this seems to be somewhat common and hard to replicate for the vitest team
vitest-dev/vitest#2008

While the main fix was

import fetch from "node-fetch"

// @ts-ignore
globalThis.fetch = fetch

in our test setup

I've also upgraded vitest in the process.

Unfortunately these changes have also caused the code coverage to crash. I'm actually not worried about this because, we don't actually use the reports at all they just run. When I set them up the theory is that by running them with each PR I'll at least know when they break, so if we get to the point where we want to look at coverage reports we won't have to first debug why they don't run.
However I don't think we'll ever want these reports. Since we have run some of our tests with playwright due to the stream, the coverage reports don't actually reflect our test coverage and never will so it's garbage information. so I'm okay with loosing these.

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