Add dialog window for deleting data views/dashboards and test functionality with new E2E-test #3137
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Purpose
Add a dialog window when the delete button for a data view or dashboard is clicked. The dialog window demands confirmation from the user for deleting a data view or dashboard. To test the functionality of this dialog window, a new test is introduced: it checks that canceling a deletion action keeps the items intact and confirms successful deletion afterward. Moreover, deleteWidget.ts has been modified accordingly to consider the new dialog window.Minor bug fixes in editing mode for dashboard: "Discard"-button now functional for dashboard and data view, deletion of widget fixed, change of view mode in dashboard now also changeable in dashboard edition mode. Moreover, the delete-widget-test is fixed.
Remarks
PR introduces (a) breaking change(s): no
PR introduces (a) deprecation(s): no