feat: Make toolbox and flyout focusable (roll forward)#8939

BenHenning merged 11 commits intoRaspberryPiFoundation:rc/v12.0.0RaspberryPiFoundation/blockly:rc/v12.0.0from

BenHenning:make-toolbox-and-flyout-focusable-roll-forwardBenHenning/blockly:make-toolbox-and-flyout-focusable-roll-forwardCopy head branch name to clipboard