[wrangler] Avoid eager zone lookups when deploying routes

[ksawaneh]

Describe your change...

When deploying with routes, Wrangler previously queried the Zones API during successful deployments to try to detect route conflicts.

This PR defers that work until the bulk routes update fails, reducing unnecessary API calls and deploy latency. When a conflict is detected, Wrangler surfaces a clearer error that points to the dashboard and lists the conflicting worker(s) + route patterns.

---

• 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: this is an internal deploy-path optimization + improved error message.

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Test evidence:

• pnpm exec cross-env NODE_OPTIONS="$(node scripts/node-options-for-tests.js)" vitest run src/__tests__/deploy.test.ts (from packages/wrangler)
• pnpm --filter wrangler check:type
• pnpm --filter wrangler check:lint

Changeset:

• Added a patch changeset for wrangler.

[changeset-bot]

🦋 Changeset detected

Latest commit: f2a8206

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

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