fix(nextjs): Use domains to prevent scope bleed on backend #3574
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Prior to this PR, every request to the backend was handled in the same global scope, causing all concurrent requests to share the same hub/scope/etc, with predictably bad consequences (in this case, primarily spans and errors getting associated with the wrong transactions, but the problems would extend to any data stored on the scope which is different for each request).
This PR surrounds everything in our wrapped version of the request handler in a domain, thereby isolating each request's global scope.