Toolbar no longer supports onItemExecuted callback

[wilmaier]

Describe the bug

It appears with appui 5.x the Toolbar was reworked and no longer makes a callback to the onItemExecuted prop when a toolbar button is clicked.

To Reproduce

Open any QA-based iModel containing sheets/drawings with hypermodel links.
Go to 2D Views widget.
Enable hypermodeling.
Hover over one of the icons that appears in the view.
Try to click any of the contextual toolbar buttons.
Notice that non of them work, as action put behind them is not invoked.

Expected Behavior

The onItemExecuted callback should be called after the clicked Toolbar item is executed.

Screenshots

Desktop (please complete the applicable information)

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Additional context

No response