Remove unused dependencies in babel-preset-react-app (#5818)

* Remove unused dependencies in babel-preset-react-app

* Re-add @babel/plugin-transform-react-display-name

* Remove some dependencies again

Author: iansu

packages/babel-preset-react-app/package.json

@@ -26,10 +26,8 @@
     "@babel/plugin-proposal-decorators": "7.4.4",
     "@babel/plugin-proposal-object-rest-spread": "7.5.5",
     "@babel/plugin-syntax-dynamic-import": "7.2.0",
-    "@babel/plugin-transform-classes": "7.5.5",
     "@babel/plugin-transform-destructuring": "7.5.0",
     "@babel/plugin-transform-flow-strip-types": "7.4.4",
-    "@babel/plugin-transform-react-constant-elements": "7.5.0",
     "@babel/plugin-transform-react-display-name": "7.2.0",
     "@babel/plugin-transform-runtime": "7.5.5",
     "@babel/preset-env": "7.5.5",