[Chore] Webpack: Migrate from onBeforeSetupMiddleware
to setupMiddlewares
#2080
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Resolves the big red
[DEP_WEBPACK_DEV_SERVER_ON_BEFORE_SETUP_MIDDLEWARE] DeprecationWarning: 'onBeforeSetupMiddleware' option is deprecated. Please use the 'setupMiddlewares' option.
warnings when starting Webpack.