Revert "Upgrade storybook to v6" - #47847

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Warning: � Use --force to continue.

Aborted due to warnings.
npm ERR! code ELIFECYCLE
npm ERR! errno 3
npm ERR! blockly-mooc@0.0.161 build:dist: `NODE_ENV=production node --max_old_space_size=4096 ./node_modules/.bin/grunt clean build`
npm ERR! Exit status 3
npm ERR! 
npm ERR! Failed at the blockly-mooc@0.0.161 build:dist script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/ubuntu/.npm/_logs/2022-08-29T17_09_38_883Z-debug.log
Tasks: TOP => build:apps
(See full trace by running task with --trace)