fix(webpackDevServer): disable overlay for warnings (#11413)

Author: jawadsh123

packages/react-scripts/config/webpackDevServer.config.js

@@ -86,7 +86,10 @@ module.exports = function (proxy, allowedHost) {
         pathname: sockPath,
         port: sockPort,
       },
-      overlay: true,
+      overlay: {
+        errors: true,
+        warnings: false,
+      },
     },
     devMiddleware: {
       // It is important to tell WebpackDevServer to use the same "publicPath" path as