Upgrade Web UI to Create-React-App 4 and React 17 (#1105)

* Upgrade to CRA 4.0.3

* Try to fix tests. No lucky

* Fix new ESLint errors

* Fix JS tests and remove unwanted dependency. (#1106)

* Fix tests

* Fix lint

* Remove React v16 workaround (fixed in v17)

* Force eslint to break on warnings

* Lint now needs to be called explicitly in the pipeline

Co-authored-by: Yash Jipkate <34203227+YashJipkate@users.noreply.github.com>

ui/src/i18n/useGetLanguageChoices.js

@@ -1,7 +1,7 @@
 // React Hook to get a list of all languages available. English is hardcoded
 import { useGetList } from 'react-admin'
 
-export default () => {
+const useGetLanguageChoices = () => {
   const { ids, data, loaded, loading } = useGetList(
     'translation',
     { page: 1, perPage: -1 },
@@ -17,3 +17,5 @@ export default () => {
 
   return { choices, loaded, loading }
 }
+
+export default useGetLanguageChoices