fix: avoid esbuild warning when running dev/bundle

[threepointone]

(Another simpler take on https://github.com/cloudflare/workers-sdk/pull/5999, inspired by https://github.com/cloudflare/workers-sdk/pull/6006)

I've been experimenting with esbuild 0.21.4 with wrangler. It's mostly been fine. But I get this warning every time

▲ [WARNING] Import "__INJECT_FOR_TESTING_WRANGLER_MIDDLEWARE__" will always be undefined because there is no matching export in "src/index.ts" [import-is-undefined]

    .wrangler/tmp/bundle-Z3YXTd/middleware-insertion-facade.js:8:23:
      8 │ .....(OTHER_EXPORTS.__INJECT_FOR_TESTING_WRANGLER_MIDDLEWARE__ ?? []),
        ╵

This is because esbuild@0.18.5 enabled a warning by default whenever an undefined import is accessed on an imports object. However we abuse imports to inject stuff in middleware.test.ts. A simple fix is to only inject that code in tests.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 4d9dd57bb4dbf327c17a08e94d00378e4b699669

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/9519135628/npm-package-wrangler-6043

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

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/6043/npm-package-wrangler-6043

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9519135628/npm-package-wrangler-6043 dev path/to/script.js

Additional artifacts:

```sh npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9519135628/npm-package-create-cloudflare-6043 --no-auto-update ``` ```sh npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9519135628/npm-package-cloudflare-kv-asset-handler-6043 ``` ```sh npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9519135628/npm-package-miniflare-6043 ``` ```sh npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9519135628/npm-package-cloudflare-pages-shared-6043 ``` ```sh npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/9519135628/npm-package-cloudflare-vitest-pool-workers-6043 ``` 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@3.60.3 includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20240610.0
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.

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