test: remove first level sleep in tests and use fake timers

[Balastrong]

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✅ Successfully ran 1 target

• nx affected --targets=test:format,test:sherif,test:knip,test:eslint,test:lib,test:types,test:build,build --parallel=3

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[lachlancollins]

Works locally with pnpm test:ci --skip-nx-cache, fingers crossed it works in CI!

[lachlancollins]

@Balastrong I re-ran the failed CI workflow and it passed (I think the tests were just flaky). Hopefully this PR is a more stable solution!

[Balastrong]

Thank you!