test: add checks of uploads of very large number of Pages assets

[petebacondarwin]

What this PR solves / how to test

Adds a test to avoid accidentally breaking Pages uploads for large numbers of assets.

This test would have failed after the #5632 change.

Author has addressed the following

• Tests
  • [ ] TODO (before merge)
  • [x] Included
  • [ ] Not necessary because:
• E2E Tests CI Job required? (Use "e2e" label or ask maintainer to run separately)
  • [ ] I don't know
  • [ ] Required / Maybe required
  • [x] Not required because: just a new non-e2e test added
• Changeset (Changeset guidelines)
  • [ ] TODO (before merge)
  • [ ] Included
  • [x] Not necessary because: just adding a test
• Public documentation
  • [ ] TODO (before merge)
  • [ ] Cloudflare docs PR(s):
  • [x] Not necessary because: just adding a test

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: ea441c24c2ca362250e4cfc7cdfb53684fb811a2

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/9484220166/npm-package-wrangler-6010

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

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/6010/npm-package-wrangler-6010

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9484220166/npm-package-wrangler-6010 dev path/to/script.js

Additional artifacts:

```sh npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9484220166/npm-package-create-cloudflare-6010 --no-auto-update ``` ```sh npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9484220166/npm-package-cloudflare-kv-asset-handler-6010 ``` ```sh npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9484220166/npm-package-miniflare-6010 ``` ```sh npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9484220166/npm-package-cloudflare-pages-shared-6010 ``` ```sh npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9484220166/npm-package-cloudflare-vitest-pool-workers-6010 ``` 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@3.60.2 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.

[holopin-bot[bot]]

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[GregBrimble]

Now we have the bot installed, I'm just testing Holopin really quickly here, sorry! Don't mind me!