fix: reduce the number of parallel file reads on Windows to avoid EMFILE type errors

[RamIdeas]

What this PR solves / how to test

Reapplies the batching reverted in #6002 but with a tested helper method to ensure batches are correctly compiled

Author has addressed the following

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

[changeset-bot]

🦋 Changeset detected

Latest commit: f919908

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

This PR includes changesets to release 2 packages

Name	Type
wrangler	Patch
@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/9488330209/npm-package-wrangler-6009

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

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/6009/npm-package-wrangler-6009

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9488330209/npm-package-wrangler-6009 dev path/to/script.js

Additional artifacts:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9488330209/npm-package-create-cloudflare-6009 --no-auto-update

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9488330209/npm-package-cloudflare-kv-asset-handler-6009

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9488330209/npm-package-miniflare-6009

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9488330209/npm-package-cloudflare-pages-shared-6009

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9488330209/npm-package-cloudflare-vitest-pool-workers-6009

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

---

wrangler@3.60.2 includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20240605.0
workerd	1.20240605.0	1.20240605.0
workerd --version	1.20240605.0	2024-06-05

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

[andyjessop]

LGTM 👍

[andyjessop]

Is there a reason this needs to be a generator rather than a standard function returning an array?

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