Throw warning if someone uses NextJS experimental-edge-runtime

[AbhiPrasad]

Problem Statement

The SDK does not support NextJS experimental-edge-runtime as per #4206.

Solution Brainstorm

User hit issues all the time where they try to use experimental-edge-runtime and things break. Until we have proper support for it, we should emit a warning during build time against this.

[wconnorwalsh]

It isn't just the experimental-edge-runtime that is the issue – it's also the generally available middleware (first introduced nearly a year ago).

Emitting a warning at build time is not good enough. This is a major part of the future of NextJS/Vercel platform and it is only a short amount of time before all of it is out of beta. Until Sentry can support this, new features in minor releases that are silently failing in the edge-runtime (e.g., autoInstrumentServerFunctions) should be disabled by default.