feat: Fix ARIA roles and setup for fields (experimental)#9384

BenHenning merged 6 commits intoRaspberryPiFoundation:add-screen-reader-support-experimentalRaspberryPiFoundation/blockly:add-screen-reader-support-experimentalfrom

BenHenning:fix-aria-roles-and-structures-for-fieldsBenHenning/blockly:fix-aria-roles-and-structures-for-fieldsCopy head branch name to clipboard