fix: minor performance improvement to the url polyfill used by the vitest integration

[petebacondarwin]

What this PR solves / how to test

This aligns our code with the best practice added to the node.js runtime recently.
See nodejs/node@7196946

Author has addressed the following

• Tests
  • TODO (before merge)
  • Included
  • Not necessary because: refactoring already covered by current tests
• E2E Tests CI Job required? (Use "e2e" label or ask maintainer to run separately)
  • I don't know
  • Required / Maybe required
  • Not required because: vitest integration node covered by e2e
• Changeset (Changeset guidelines)
  • TODO (before merge)
  • Included
  • Not necessary because:
• Public documentation
  • TODO (before merge)
  • Cloudflare docs PR(s):
  • Not necessary because: internal refactoring

[changeset-bot]

🦋 Changeset detected

Latest commit: 1254d6d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@cloudflare/vitest-pool-workers	Patch

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[github-actions]

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/10845244709/npm-package-wrangler-6700

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

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/6700/npm-package-wrangler-6700

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/10845244709/npm-package-wrangler-6700 dev path/to/script.js

Additional artifacts:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/10845244709/npm-package-create-cloudflare-6700 --no-auto-update

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/10845244709/npm-package-cloudflare-kv-asset-handler-6700

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/10845244709/npm-package-miniflare-6700

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/10845244709/npm-package-cloudflare-pages-shared-6700

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/10845244709/npm-package-cloudflare-vitest-pool-workers-6700

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/10845244709/npm-package-cloudflare-workers-editor-shared-6700

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/10845244709/npm-package-cloudflare-workers-shared-6700

Note that these links will no longer work once the GitHub Actions artifact expires.

---

wrangler@3.77.0 includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20240909.0
workerd	1.20240909.0	1.20240909.0
workerd --version	1.20240909.0	2024-09-09

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