[WIP] pages: Fix "worker called response.clone()" warnings in wrangler pages dev

[CarmenPopoviciu]

Fixes #3259

What this PR solves / how to test:
// TODO add proper description when out of WIP

Author has included the following, where applicable:

• Tests
• Changeset (Changeset guidelines)

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• Checked for inclusion of relevant tests
• Checked for inclusion of a relevant changeset
• Checked for creation of associated docs updates
• Manually pulled down the changes and spot-tested

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[changeset-bot]

⚠️ No Changeset found

Latest commit: 04662e2

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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/6534001661/npm-package-wrangler-4185

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

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/6534001661/npm-package-wrangler-4185

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/6534001661/npm-package-wrangler-4185 dev path/to/script.js

Additional artifacts:

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/6534001661/npm-package-cloudflare-pages-shared-4185

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

---

[email protected] includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	3.20231010.0	3.20231010.0
workerd	1.20231010.0	1.20231010.0
workerd --version	1.20231010.0	2023-10-10

|

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

[codecov]

Codecov Report

Merging #4185 (04662e2) into main (36d4978) will increase coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #4185      +/-   ##
==========================================
+ Coverage   75.37%   75.41%   +0.03%     
==========================================
  Files         223      223              
  Lines       12217    12217              
  Branches     3159     3159              
==========================================
+ Hits         9209     9213       +4     
+ Misses       3008     3004       -4     

see 3 files with indirect coverage changes

[GregBrimble]

Don't think this can be merged, unfortunately.

<!-- public/index.html -->
<h1>Hello, world!</h1>
<form action="/submit" method="POST">
	<input type="text" name="name" placeholder="Enter your name" />
	<button type="submit">Submit</button>
</form>

// functions/_middleware.ts
export const onRequestPost = async ({ request, next }) => {
	const formData = await request.formData();
	console.log("Logging in middleware", Object.fromEntries(formData.entries()));
	return next();
};

// functions/submit.ts
export const onRequestPost = async ({ request }) => {
	const formData = await request.formData();
	return Response.json(Object.fromEntries(formData.entries()));
};

This errors with this prerelease but works with wrangler@latest.