chore(tests): Migrate to vitest pool workers

[AdiRishi]

Cloudflare has a pre-release going for the miniflare 3 setup for vitest.

Getting Started Template: https://github.com/mrbbot/vitest-pool-workers-prerelease-getting-started (you'll want to use the latest pre-release from cloudflare/workers-sdk#5070 (comment), expand Additional artifacts to see the @cloudflare/vitest-pool-workers package)
Examples: https://github.com/cloudflare/workers-sdk/tree/bcoll/vitest-pool-workers-examples/fixtures/vitest-pool-workers-examples
Docs: https://admah-vitest-pool-docs.cloudflare-docs-7ou.pages.dev/workers/testing/vitest-integration/get-started/

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Pull Request Test Coverage Report for Build 8294115550

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• Overall coverage increased (+1.3%) to 99.487%

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Totals
Change from base Build 8292293804:	1.3%
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