Throw a helpful error if Vite can't resolve the main entrypoint

[ascorbic]

Currently, if Vite can't resolve a worker entrypoint it throws the confusing error Error: [vite]: Rollup failed to resolve import "virtual:cloudflare/user-entry" from "virtual:cloudflare/worker-entry". Previously this was not encountered often, because missing entrypoint files are caught earlier. However with bare modules and dynamically-generated config this is possible to run into. This PR catches the failed resolution and throws a more helpful error.

---

• Tests
  • Tests included/updated
  • Tests not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: just an error update
• Wrangler V3 Backport
  • Wrangler PR:
  • Not necessary because: not wrangler

[changeset-bot]

🦋 Changeset detected

Latest commit: dc2bb89

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

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commit: dc2bb89