T27133 remove deprecated QmitkDataSelectionWidget
Summary:
BREAKING!!! What: Remove QmitkDataSelectionWidget Why: not needed anymore How to adapat: Use node selection widgets
+ fixed T27133
Test Plan: unit test /CI
Reviewers: O1 MITK Reviewer Group I, kislinsk
Reviewed By: O1 MITK Reviewer Group I, kislinsk
Maniphest Tasks: T27133
Differential Revision: https://phabricator.mitk.org/D928