add ai bindings example (cloudflare#21213)

Author: emily-shen

src/content/docs/workers/testing/vitest-integration/recipes.mdx

@@ -25,3 +25,4 @@ Recipes are examples that help demonstrate how to write unit tests and integrati
 - [Tests using JSRPC with entrypoints and Durable Objects](https://github.com/cloudflare/workers-sdk/tree/main/fixtures/vitest-pool-workers-examples/rpc)
 - [Integration test with static assets and Puppeteer](https://github.com/GregBrimble/puppeteer-vitest-workers-assets)
 - [Resolving modules with Vite Dependency Pre-Bundling](https://github.com/cloudflare/workers-sdk/tree/main/fixtures/vitest-pool-workers-examples/module-resolution)
+- [Mocking Workers AI and Vectorize bindings in unit tests](https://github.com/cloudflare/workers-sdk/tree/main/fixtures/vitest-pool-workers-examples/ai-vectorize)