fix(wrangler): show correct port in scheduled worker warning

[jalmonter]

Issue: When running wrangler dev with a worker that has cron triggers, the warning message displayed an invalid URL like curl "http://localhost:undefined/cdn-cgi/handler/scheduled" because the port wasn't yet determined when the warning was logged.

Fix: Moved the warning to after the proxy server is fully ready, where the actual public URL and port are known.

---

• Tests
  • [ ] Tests included/updated
  • [x] Tests not necessary because: only shows a warning
• Public documentation
  • [ ] Cloudflare docs PR(s):
  • [x] Documentation not necessary because: only shows a warning
• Wrangler V3 Backport
  • [ ] Wrangler PR:
  • [x] Not necessary because: not a patch change

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Latest commit: e693fd0ef0f48702e5664bb7070c0a2723ef2cbd

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commit: e693fd0