chore: move axe a11y checks to the regression testing suite

[balzss]

INSTUI-4611

this pr:

• removes everything related to storybook
• deletes all .examples.tsx files that were used for storybook example generation
• move axe checking to the regression testing suite
• adds a feature cypress in regression testing so it fails if there is a console.error message

test plan:

• scan the codebase for anything that could be related to storybook examples -> there should be none
• check any script or package.json for remaining storybook related packages
• check if everything axe (a11y) related is removed from the main codebase and only present in the regression test subfolder

[github-actions]

PR Preview Action v1.6.1
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2025-06-20 17:21 UTC

[matyasf]

Some initial remarks:

• there are some traces of Storybook in some of our docs: dev-commands.md, ui-scripts's Readme.md, .npmignore files
• ui-test-utils also have some, or this one will be removed later?

[balzss]

@matyasf

• there are some traces of Storybook in some of our docs: dev-commands.md, ui-scripts's Readme.md, .npmignore files

good catch, I'll remove these

• ui-test-utils also have some, or this one will be removed later?

that whole package will be removed by @git-nandor in a separate PR

[matyasf]

looks good, just a small doc change

[matyasf]

Please also write here that one can run the test suite with npm run cypress. Also it would be nice to mention regression testing in https://instructure.design/#testing-overview , maybe just link this file on Github master branch