QWAT Release 1.5.0 Phase

Overview issue for QWAT Release 2026.1 Phase planning

- [x] _Add Sub-issues for the different phases_
- [x] _Label as release_
- [x] _Add Start date and Target date_
- [x] _Maintain Status_
- [x] _Link to Milestone_
- [X]  _Inform about release phase (mail)_
- [ ] _Testing call_