[v13.0.0-beta.0] Missing keyboard shortcuts

[microbit-robert]

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Description

The following keyboard shortcuts are currently missing if the aim is parity with the keyboard navigation plugin:

• Duplicate (d)
• Clean up workspace (c)
• 'list_shortcuts' is never installed and this function will always return early
  • I am also not sure how this hint is triggered, I've not managed to get into this branch when testing

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[maribethb]

The list shortcuts action is not going into core, by design, so that's going to take a little bit longer before we have a separate standalone plugin for the modal for the list of shortcuts. Makecode uses their own help window though, right? if you name that shortcut list_shortcuts then it should work? I'm going to file a separate tracking issue for the plugin for the list shortcuts modal.

There are not very many blocks that don't have an "in" node so it's more rare to see that message than the arrow key one, but one example is the "random fraction" math block.

[maribethb]

Fixed by #9728 and #9727

Filed RaspberryPiFoundation/blockly-samples#2687 for the list_shortcuts