SUMMARY
This is standard behaviour for menus, and should be implemented here. Currently we are required to manually `menuDialog.close()` at the end of the action's `onTriggered` signal, like this:

    Kirigami.Action {
        id: myAction
        onTriggered: { myFunc(); menuDialog.close() }
    }

The problem with this is it means we cannot use this action in other contexts. For example we may want a Kirigami.MenuDialog on mobile devices and a QQC2.Menu on desktop. I should be able to just plug the same action into both components, but instead I have to define two near-identical actions to deal with MenuDialog.

STEPS TO REPRODUCE
1. Open Kirigami Gallery and navigate to the Dialogues page
2. Open the MenuDialog component
3. Click a list item

OBSERVED RESULT
Item is clicked, menu is still open

EXPECTED RESULT
Item is clicked, menu is closed

SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20230724
KDE Plasma Version: 5.27.6
KDE Frameworks Version: 5.108.0
Qt Version: 5.15.10
Kernel Version: 6.4.4-1-default (64-bit)
Graphics Platform: X11

ADDITIONAL INFORMATION