Add mocked AI/Vectorize bindings to vitest examples

[emily-shen]

Summary

Docs for cloudflare/workers-sdk#8624

Screenshots (optional)

Documentation checklist

• The documentation style guide has been adhered to.
• If a larger change - such as adding a new page- an issue has been opened in relation to any incorrect or out of date information that this PR fixes.
• Files which have changed name or location have been allocated redirects.

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PR Change Summary

Added mocked AI and Vectorize bindings to the Vitest examples documentation.

• Introduced a new example for mocking Workers AI and Vectorize bindings in unit tests.
• Updated the recipes section to include the new mocking example.

Modified Files

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

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Preview URL: https://8c4f6a3f.preview.developers.cloudflare.com
Preview Branch URL: https://emily-vitest-ai.preview.developers.cloudflare.com

Files with changes (up to 15)

Original Link	Updated Link
https://developers.cloudflare.com/workers/testing/vitest-integration/recipes/	https://emily-vitest-ai.preview.developers.cloudflare.com/workers/testing/vitest-integration/recipes/