Chore: Upgrade ESLint and Stylelint major versions #2696
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This PR upgrades ESLint from v7 to v8, and Stylelint (plus related dependencies) from v13 to v14.
There are no significant changes to mention regarding ES lint.
Stylelint decreased its core scope to focus only on CSS, not Sass, Less, etc, so the tooling pipeline changed. Scss files are still first class citizens. But Less is now secondary as it becomes less fashionable, and as such has to reach into a PostCSS plugin for a new "custom syntax override" behavior. New lint rules were also introduced. This PR fixes errors from new linting rules and updates the config.
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