Next server-side example and A4T reporting

Hi!

I've took the `next-server-side-rendering-demo` example and tried to implement A4T reporting according to this [doc](https://adobetarget-sdks.gitbook.io/docs/integration-with-experience-cloud/analytics-for-target-a4t-reporting)

I've updated all static files (`AppMeasurement.js`, `at.js`, `VisitorAPI.js`), `target-config.json` and added the following changes to the `helpers/target-server-side.js`

After running the code, I was hoping to see the corresponding A/B test report in Adobe Analytics, but I don't see any reports.

My A/B test has been created with form composer, where I've defined a simple JSON offer (feature flag) like
```
A experience
{
"value": false
}

B experience
{
"value": true
}
```

Have I made something wrong or missed something? Or maybe A4T reporting doesn't work for form composer?

Run the next-server-side-rendering-demo and compare its target-config.json, helpers/target-server-side.js, and static AppMeasurement.js, at.js, and VisitorAPI.js files with the linked A4T documentation. Done means identifying the reporting setup issue and confirming that the form-composer test produces an Adobe Analytics A/B report.

Written by the indexing model from the issue text.