Add fixtures using startWorker() and Miniflare directly

[penalosa]

Just adding some additional fixtures to demostrate direct use of the Miniflare API and startWorker() in a non-Vitest testing framework.

---

• Tests
  • TODO (before merge)
  • Tests included
  • Tests not necessary because:
• E2E Tests CI Job required? (Use "e2e" label or ask maintainer to run separately)
  • I don't know
  • Required
  • Not required because: only changes fixtures
• Public documentation
  • TODO (before merge)
  • Cloudflare docs PR(s):
  • Documentation not necessary because: only changes fixtures

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[vicb]

Very nice PR!

nit: "worker build" and "worker" names in the next file are not very descriptive.

(question: how to use a different worked when interacting with Miniflare? I don't see an option so I guess MINIFLARE_WORKERD_VERSION is respected?)