- Set the browser target to ES6 and reduce the JS bundle size considerably

- Upgrade ESLint to v9.x and migrate the .eslintrc.js file to make it work

web/regression/javascript/fake_theme.js

@@ -2,7 +2,6 @@ import React from 'react';
 import Theme from 'sources/Theme';
 
 export function withTheme(WrappedComp) {
-  // eslint-disable-next-line react/display-name
   return (props)=>{
     return <Theme><WrappedComp {...props}/></Theme>;
   };