fix: Ensure selection stays when dragging blocks, comments, and bubbles#9034

BenHenning merged 9 commits intoRaspberryPiFoundation:rc/v12.0.0RaspberryPiFoundation/blockly:rc/v12.0.0from

BenHenning:fix-selection-lost-on-dragBenHenning/blockly:fix-selection-lost-on-dragCopy head branch name to clipboard