fix(nextjs): Add tracing extensions in all serverside wrappers

[lforst]

Fixes issues reported in #9461

This will add addTracingExtension() calls to all auto instrumentation wrappers because they will attempt to start transactions and if the tracing extensions are not set the sdk will print an ugly warning.

This is only serverside so bundlesize shouldn't matter here.

[mydea]

This seems fine, maybe we find a way to abstract this away - e.g. can we export a wrapping startTransaction that basically does:

import { startTransaction as _startTransaction, addTracingExtensions } from '@sentry/core';

export function startTransaction() {
  addTracingExtensions();
  return _startTransaction(...arguments);
}

And use this everywhere (or something like this)? Not sure how easy that would be in the next architecture...!

[lforst]

@mydea This doesn't seem like a bad idea. Maybe we have these wrappers for our server SDKs.