fix(nextjs): Adjust path to requestAsynStorageShim.js template file (#13928)

Looks like we missed adding the `build` dir to the template path of
`requestAsyncStorageShim` in the NextJS SDK when we changed the
package-internal directory structure a while ago (IIRC this was pre-v8
but not sure actually)

I'm a bit surprised that this works at all, given we use `exports`
conditions and this is a path to a specific file not covered by any
`exports` entry. But I guess webpack can handle this still.

EDIT: Well turns out, this doesn't work. We'll need to add the `exports`
entries.

fixes #13925

closes #13926
closes #13927

Author: Lms24

Diff for: packages/nextjs/src/config/loaders/wrappingLoader.ts

@@ -174,7 +174,7 @@ export default function wrappingLoader(
       }
       templateCode = templateCode.replace(
         /__SENTRY_NEXTJS_REQUEST_ASYNC_STORAGE_SHIM__/g,
-        '@sentry/nextjs/esm/config/templates/requestAsyncStorageShim.js',
+        '@sentry/nextjs/build/esm/config/templates/requestAsyncStorageShim.js',
       );
     }