Add documentation on how to migrate from previous versions of @cloudflare/vitest-pool-workers to the newest minor version #29463
Description
Existing documentation URL(s)
The update here (cloudflare/workers-sdk#11632) to @cloudflare/vitest-pool-workers is a breaking change, despite being marked as a minor version upgrade. The changes in this package include a mandatory upgrade to Vitest v4, as well as new methods of defining a Cloudflare specific vitest.config.ts, changes to how mock outgoing fetches, and how to test using SELF.fetch.
We should absolutely have a migration guide for users, as we've hidden the "older" docs describing previous versions of the package, leaving users somewhat stranded without a clear guide on what needs to change.
https://3dbd7e73.preview.developers.cloudflare.com/workers/testing/vitest-integration/migration-guides/migrate-from-miniflare-2/ contains a previous versions of the docs.
What changes are you suggesting?
Requested change Addition of a migration guide for the Vitest Pool Workers section, eg: https://3dbd7e73.preview.developers.cloudflare.com/workers/testing/vitest-integration/migration-guides/migrate-from-miniflare-2/. This should contain the changes necessary to migrate to versions of @cloudflare/vitest-pool-workers@0.13.0 and above.
Why? This would help users navigate the breaking changes in the package, what was deprecated, and what changes they'll need to make.
Outcome: Users will have a guide to support upgrading between versions, as well as a reference to how the previous versions of the package worked.
Additional information
No response