Simplify /cdn-cgi/ handling

[jamesopstad]

This reverts #12855 and adds a test to ensure that the Local Explorer UI is served. It turns out that the changes in that PR were unnecessary (I'm not sure if that was true at the time or if something has changed since).

The only /cdn-cgi/ routes we need to add special handling for are /cdn-cgi/handler/* so that trigger handlers invoke the User Worker.

---

• 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: internal change

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Latest commit: b1882ba

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commit: b1882ba

[workers-devprod]

Codeowners approval required for this PR:

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Show detailed file reviewers

• packages/vite-plugin-cloudflare/playground/bindings/tests/worker.spec.ts: [@cloudflare/wrangler]
• packages/vite-plugin-cloudflare/playground/bindings/src/index.ts: [@cloudflare/wrangler]
• packages/vite-plugin-cloudflare/src/index.ts: [@cloudflare/wrangler]
• packages/vite-plugin-cloudflare/src/plugins/cdn-cgi.ts: [@cloudflare/wrangler]
• packages/vite-plugin-cloudflare/src/plugins/trigger-handlers.ts: [@cloudflare/wrangler]

[devin-ai-integration]

✅ Devin Review: No Issues Found

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