enhancement
In scripted tests, it should be possible to verify the selection of components. With `Selectable`, this has so far only been possible if they are also `SelectionModelOwner`.
The TreeTableComponent, for example, is not: It stores the selection in the TableViewModel. Although this has a SelectionModel, it is not a com.top_logic.mig.html.SelectionModel but a javax.swing.ListSelectionModel. Therefore, the selection in TreeTableComponents cannot currently be verified.
Implementation: ` SelectableSelectionNaming ` returns the selection of a ` Selectable`.
Test
TestTreeTableSelectionAfterCollapse.script.xml from #24680.