[MIG] bemade_fsm to 18.0
Aside from fixing standard 17.0..18.0 stuff and fixing XML ID
references:
1. **Remove `_get_closed_stage_by_project()`**: This method is
obsolete - it was copied from base FSM but no longer exists in
18.0. Base system now uses `is_closed` field.
2. **Implement State Propagation**: Enhance the `write()` method
to propagate done/cancelled states to child tasks using `is_closed` field logic.
3. **Test Task Creation**: Thoroughly test the custom task creation logic
against base 18.0
All 56 tests are passing.
