Fix: vitest-pool-workers use env in .dev.vars

[Skye-31]

What this PR solves / how to test

https://github.com/cloudflare/workers-sdk/pull/5612 added support for selecting the environment of config used, but it missed passing it to the code that reads .dev.vars.{environment}

Fixes #5641

Author has addressed the following

• Tests
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  • [ ] 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
  • [x] Not required because:
• Changeset (Changeset guidelines)
  • [ ] TODO (before merge)
  • [x] Included
  • [ ] Not necessary because:
• Public documentation
  • [ ] TODO (before merge)
  • [ ] Cloudflare docs PR(s):
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[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: bb7a6bad4b830c3b7a1aff6d3fac955687e285e0

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[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/9759525158/npm-package-wrangler-6180

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

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/6180/npm-package-wrangler-6180

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9759525158/npm-package-wrangler-6180 dev path/to/script.js

Additional artifacts:

```sh npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9759525158/npm-package-create-cloudflare-6180 --no-auto-update ``` ```sh npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9759525158/npm-package-cloudflare-kv-asset-handler-6180 ``` ```sh npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9759525158/npm-package-miniflare-6180 ``` ```sh npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9759525158/npm-package-cloudflare-pages-shared-6180 ``` ```sh npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9759525158/npm-package-cloudflare-vitest-pool-workers-6180 ``` 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@3.62.0 includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20240620.0
workerd	1.20240620.1	1.20240620.1
workerd --version	1.20240620.1	2024-06-20

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