Support containers on Vite auxiliary Workers

[penalosa]

Fixes #10178 & DEVX-2159

Support containers on Vite auxiliary Workers

---

• Tests
  • Tests included
  • Tests not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: bugfix
• Wrangler V3 Backport
  • Wrangler PR:
  • Not necessary because: not a Wrangler change

[changeset-bot]

🦋 Changeset detected

Latest commit: c3b9ecd

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

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commit: c3b9ecd

[penalosa]

This changes this playground so that the container is attached to an auxiliary Worker, with the entrypoint Worker passing through all requests. This means that the existing tests now test both whether containers work in general, and whether they work for auxiliary Workers