Remove access to `Buffer` in `@edge-runtime/jest-environment`

[guisehn]

Fixes https://github.com/vercel/edge-runtime/issues/952

Removes access to global Buffer variable from Node when using @edge-runtime/jest-environment.

Buffer will not be available in production when using the edge runtime, so it should also be unavailable in tests. That way, we can catch in tests when unavailable APIs are used.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: ea9a5a442b29ffe749c74f416f06a7a2d50555fe

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

This PR includes changesets to release 1 package

| Name | Type | | ------------------------------ | ----- | | @edge-runtime/jest-environment | Major |

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[Kikobeats]

Thanks for this!