Stunner - keyboard shortcuts - need to explicitly select element

Stunner Keyboard shortcuts implemented in JBPM-6385 don't work immediately after element is added to canvas (doesn't matter if via context popup dialog or palette) or if element is selected from diagram explorer or navigation dock (in case of DMN).

User has to explicitly select element by mouse click in the canvas.

Acceptance test

• Select element explicitly by click in canvas, try shortcuts
• Select element in diagram explorer, try shortcuts
• Select element in navigator dock (dmn only), try shortcuts
  • https://github.com/kiegroup/kie-wb-common/pull/2093
• Append element via palette, try shortcuts
• Append element via poput context dialog, try shorcuts