Add support for Navigation in Drupal 11.2

Problem/Motivation

In Drupal 11.2, the navigation module is on its way to default and the toolbar got deprecated and will be removed soon. That means, our widget in the top toolbar is no longer visible and we should add it to the new navigation on the left.

Proposed resolution

Either we add a button with a drop-down as we do that now, but that would be a break in UX.

Or we follow the path of the navigation_extra_tools module and define the links as part of the menu tree. But then we have to add data-dialog attributes via ajax.