refactor workers.new tests to use vitest intregration

[petebacondarwin]

What this PR solves / how to test

Fixes #[insert GH or internal issue number(s)].

Author has addressed the following

• Tests
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• E2E Tests CI Job required? (Use "e2e" label or ask maintainer to run separately)
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• Changeset (Changeset guidelines)
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• Public documentation
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  • [ ] Cloudflare docs PR(s):
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[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: 0cd7bb8e648389074b855599f70e288f9a911c14

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions[bot]]

A wrangler prerelease is available for testing. You can install this latest build in your project with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9660554691/npm-package-wrangler-6141

You can reference the automatically updated head of this PR with:

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/6141/npm-package-wrangler-6141

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9660554691/npm-package-wrangler-6141 dev path/to/script.js

Additional artifacts:

```sh npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9660554691/npm-package-create-cloudflare-6141 --no-auto-update ``` ```sh npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9660554691/npm-package-cloudflare-kv-asset-handler-6141 ``` ```sh npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9660554691/npm-package-miniflare-6141 ``` ```sh npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9660554691/npm-package-cloudflare-pages-shared-6141 ``` ```sh npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9660554691/npm-package-cloudflare-vitest-pool-workers-6141 ``` Note that these links will no longer work once [the GitHub Actions artifact expires](https://docs.github.com/en/organizations/managing-organization-settings/configuring-the-retention-period-for-github-actions-artifacts-and-logs-in-your-organization).

---

wrangler@3.61.0 includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20240610.1
workerd	1.20240610.1	1.20240610.1
workerd --version	1.20240610.1	2024-06-10

Please ensure constraints are pinned, and miniflare/workerd minor versions match.

[petebacondarwin]

Closing in favour of #6158