First you have a messed up repository list as you are using unstable repos on Tumbleweed…but thats not all. You should also understand that you need to use different commands for the different libraries:
qdbus from libqt4:
qdbus org.kde.klipper /klipper org.kde.klipper.klipper.getClipboardHistoryMenu
qdbus-qt5 from libqt5-qdbus:
qdbus-qt5 org.kde.klipper /klipper org.kde.klipper.klipper.getClipboardHistoryMenu
qdbus6 from qt6-tools-qdbus:
qdbus6 org.kde.klipper /klipper org.kde.klipper.klipper.getClipboardHistoryMenu
This can easily be found by inspecting the provided filelist of the three packages…