fix(vite-plugin-cloudflare): handle socket errors during WebSocket upgrade

[edmundhung]

Fixes #12047.

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• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: bugfix

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[changeset-bot]

🦋 Changeset detected

Latest commit: 1e2aafc

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[pkg-pr-new]

create-cloudflare

npm i https://pkg.pr.new/create-cloudflare@12052

@cloudflare/kv-asset-handler

npm i https://pkg.pr.new/@cloudflare/kv-asset-handler@12052

miniflare

npm i https://pkg.pr.new/miniflare@12052

@cloudflare/pages-shared

npm i https://pkg.pr.new/@cloudflare/pages-shared@12052

@cloudflare/unenv-preset

npm i https://pkg.pr.new/@cloudflare/unenv-preset@12052

@cloudflare/vite-plugin

npm i https://pkg.pr.new/@cloudflare/vite-plugin@12052

@cloudflare/vitest-pool-workers

npm i https://pkg.pr.new/@cloudflare/vitest-pool-workers@12052

@cloudflare/workers-editor-shared

npm i https://pkg.pr.new/@cloudflare/workers-editor-shared@12052

@cloudflare/workers-utils

npm i https://pkg.pr.new/@cloudflare/workers-utils@12052

wrangler

npm i https://pkg.pr.new/wrangler@12052

commit: 1e2aafc

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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