[wrangler] Add type generation for AI Search bindings

[G4brym]

Fixes RAG-1028.

Add AiSearchNamespace and AiSearchInstance type generation to wrangler types for ai_search_namespaces and ai_search config bindings. Both simple and per-environment modes are now supported.

Previously, AI Search bindings were fully integrated into wrangler (config, validation, deployment, local dev, CLI commands) but were missing from wrangler types output. This PR closes that gap so that running wrangler types now generates the correct TypeScript types for both binding kinds:

interface Env {
  AI_SEARCH_NS: AiSearchNamespace;  // from ai_search_namespaces config
  BLOG_SEARCH: AiSearchInstance;     // from ai_search config
}

---

• 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 type generation change with no user-facing documentation impact.

---

[changeset-bot]

🦋 Changeset detected

Latest commit: f1560da

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commit: f1560da

[workers-devprod]

Codeowners approval required for this PR:

• ✅ @cloudflare/wrangler

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[G4brym]

This needs workerd to also be updated in this repo before merge.
workerd changes are already released

[petebacondarwin]

Blocked on #13155

[G4brym]

This pr is now ready to merge, i tested the preview package after rebase, and it successfully created the expected types