[vitest-pool-workers] fix: use builtin node:process module over polyfill

[mrbbot]

Ref: #5081 (review)

What this PR solves / how to test:

This PR fixes an issue when upgrading the workerd version used by @cloudflare/vitest-pool-workers. Specifically, newer versions of workerd will always load the built-in version of node:process, which doesn't support all the required functionality. Previously, our polyfill was loaded instead. This change brings the required parts of the polyfill over to the built-in version, then removes the polyfill.

Author has addressed the following:

• Tests
  • Included
  • Not necessary because: passing existing
• Changeset (Changeset guidelines)
  • Included
  • Not necessary because: @cloudflare/vitest-pool-workers isn't published yet
• Associated docs
  • Issue(s)/PR(s):
  • Not necessary because: fixing an internal regression

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[changeset-bot]

⚠️ No Changeset found

Latest commit: ab23ee2

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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/8052038672/npm-package-wrangler-5101

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

npm install --save-dev https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/prs/5101/npm-package-wrangler-5101

Or you can use npx with this latest build directly:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8052038672/npm-package-wrangler-5101 dev path/to/script.js

Additional artifacts:

npx https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8052038672/npm-package-create-cloudflare-5101 --no-auto-update

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8052038672/npm-package-cloudflare-kv-asset-handler-5101

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8052038672/npm-package-miniflare-5101

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8052038672/npm-package-cloudflare-pages-shared-5101

npm install https://prerelease-registry.devprod.cloudflare.dev/workers-sdk/runs/8052038672/npm-package-cloudflare-vitest-pool-workers-5101

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

---

wrangler@3.29.0 includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20240208.0
workerd	1.20240208.0	1.20240208.0
workerd --version	1.20240208.0	2024-02-08

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.35%. Comparing base (2aa7913) to head (ab23ee2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5101      +/-   ##
==========================================
+ Coverage   70.33%   70.35%   +0.01%     
==========================================
  Files         298      298              
  Lines       15515    15515              
  Branches     3987     3987              
==========================================
+ Hits        10913    10916       +3     
+ Misses       4602     4599       -3     

see 5 files with indirect coverage changes