Remove LESS stylesheets and dependencies (#27409)

* Remove components, core and modules LESS stylesheets

* Remove variables LESS stylesheets

* Remove app LESS stylesheets

* Remove github-sync, onboarding LESS stylesheets

* Remove main-light and IEEE LESS stylesheets

* Remove Less loader configuration

* Remove bootstrap-3 entrypoint

* Rename bootstrap-5 entrypoint to bootstrap

* Remove bootstrap-5 CSS folder and move stylesheets

* Update CSS variables

* Restore and update github-sync.scss path

* Fix try-premium.scss path and fix undefined mixin error

* Restore entrypoints

* Simplify buildCssPath to always use main-style.css

* Remove less from prettier formatting scripts

* Remove less from addHook extension

* Source format

* Remove nvd3 file reference from prettierignore (equivalent of nvd3.scss)

* Remove less and less-loader

* Add SCSS files to pirates require hook

GitOrigin-RevId: bd83c79f4d6ef7305d75993959a4dc5e7714ef9c

services/web/package.json

@@ -26,8 +26,8 @@
     "webpack:profile": "webpack --config webpack.config.prod.js --profile --json > stats.json",
     "format": "prettier --list-different $PWD/'**/*.{js,jsx,mjs,ts,tsx,json}'",
     "format:fix": "prettier --write $PWD/'**/*.{js,jsx,mjs,ts,tsx,json}'",
-    "format:styles": "prettier --list-different $PWD/'**/*.{css,less,scss}'",
-    "format:styles:fix": "prettier --write $PWD/'**/*.{css,less,scss}'",
+    "format:styles": "prettier --list-different $PWD/'**/*.{css,scss}'",
+    "format:styles:fix": "prettier --write $PWD/'**/*.{css,scss}'",
     "format:pug": "prettier --list-different $PWD/'**/*.pug'",
     "format:pug:fix": "prettier --write $PWD/'**/*.pug'",
     "lint": "eslint --max-warnings 0 --format unix --ext .js,.jsx,.mjs,.ts,.tsx .",
@@ -314,8 +314,6 @@
     "jscodeshift": "^17.0.0",
     "jsdom": "^19.0.0",
     "jsdom-global": "^3.0.2",
-    "less": "^3.13.1",
-    "less-loader": "^11.1.3",
     "match-sorter": "^6.2.0",
     "mathjax": "^3.2.2",
     "mensch": "^0.3.4",