Remove the unused "build-desktop" package.json commands (#27684)

package.json

@@ -219,9 +219,6 @@
     "build-css:style": "node-sass --include-path client assets/stylesheets/style.scss public/style.css --output-style compressed && npm run -s postcss -- public/style.css && rtlcss public/style.css public/style-rtl.css",
     "build-css:sections": "node-sass assets/stylesheets/sections --include-path client -o public/sections --source-map public/sections --output-style compressed && node bin/process-extensions-scss.js && npm run -s autoprefixer -- public/sections/*.css && rtlcss -d public/sections public/sections-rtl",
     "build:packages": "node bin/build-packages.js",
-    "prebuild-desktop": "npm run -s install-if-deps-outdated",
-    "build-desktop": "run-p -s build-server build-css",
-    "postbuild-desktop": "npm run -s bundle",
     "build-devdocs:components-usage-stats": "cross-env-shell NODE_PATH=$NODE_PATH:server:client:. npm run -s build-devdocs:components-usage-stats:_env",
     "build-devdocs:components-usage-stats:_env": "node server/devdocs/bin/generate-components-usage-stats.js \"client/**/*.js\" \"client/**/*.jsx\" \"!**/docs/**\" \"!**/test/**\" \"!**/docs-example/**\"",
     "build-devdocs:index": "cross-env-shell NODE_PATH=$NODE_PATH:server:client:. npm run -s build-devdocs:index:_env",