The data structure and the way to access the group folders have been changed. See [https://github.com/nextcloud/groupfolders/pull/3849](https://github.com/nextcloud/groupfolders/pull/3849)

We need to adapt these changes while keeping the code backwards compatible.

**NOTE**_: Begin of the insertion~~theEnd of the insertion Begin of the deletion theEnd of the deletion changes in integration app can be released after the new release of groupfolders Begin of the insertionapp.~~ prepared for 2.9.2 release so that the new groupfolders release won't break the integrationEnd of the insertion app._

These changes in groupfolders are also blocking the [CI](https://github.com/nextcloud/integration_openproject/actions/runs/16259801959/job/45902554287) Begin of the insertion

### Steps to test

1. setup integration app WITH group folder ENABLED

2. make sure that connection and group folder workEnd of the insertion