fix: include request url and headers in pretty error page

[mrbbot]

What this PR solves / how to test:

This change ensures Miniflare's pretty error page includes the URL and headers of the incoming request, rather than Miniflare's internal request from workerd to the loopback server.

The request URL has been incorrect since the pretty error page was introduced into version 3 (cloudflare/miniflare#436). The request headers have been incorrect since (cloudflare/miniflare#681). This change also adds some tests to prevent this regressing again.

To test, run wrangler dev with a worker that throws an unhandled exception and visit the page in your browser. The reported request URL should match the browser's URL, and the headers should match headers sent by the browser.

Author has addressed the following:

• Tests
  • Included
  • Not necessary because:
• Changeset (Changeset guidelines)
  • [x Included
  • Not necessary because:
• Associated docs
  • Issue(s)/PR(s):
  • Not necessary because: expected behaviour for the pretty error page

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[changeset-bot]

🦋 Changeset detected

Latest commit: 25c3705

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

This PR includes changesets to release 3 packages

Name	Type
miniflare	Patch
@cloudflare/pages-shared	Patch
wrangler	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/6878782592/npm-package-wrangler-4448

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

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/6878782592/npm-package-wrangler-4448

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/6878782592/npm-package-wrangler-4448 dev path/to/script.js

Additional artifacts:

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/6878782592/npm-package-miniflare-4448

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/6878782592/npm-package-cloudflare-pages-shared-4448

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

---

wrangler@3.15.0 includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20231025.1
workerd	1.20231030.0	1.20231030.0
workerd --version	1.20231030.0	2023-10-30

|

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

[codecov]

Codecov Report

Merging #4448 (25c3705) into main (be36619) will increase coverage by 0.03%.
Report is 1 commits behind head on main.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4448      +/-   ##
==========================================
+ Coverage   75.46%   75.50%   +0.03%     
==========================================
  Files         225      225              
  Lines       12478    12478              
  Branches     3239     3239              
==========================================
+ Hits         9417     9421       +4     
+ Misses       3061     3057       -4     

see 3 files with indirect coverage changes