DISPATCH-2234: Update JavaScript console packages for the 1.19.0 release (#1517)

* Error: A <Route> is only ever to be used as the child of <Routes> element, never rendered directly. Please wrap your <Route> in a <Routes>.
* Error: You cannot render a <Router> inside another <Router>. You should never have more than one in your app.

See https://reactrouter.com/docs/en/v6/upgrading/v5, and therein linked https://gist.github.com/mjackson/d54b40a094277b7afdd6b81f51a0393f

* BREAKING CHANGE: webpack < 5 used to include polyfills for node.js core modules by default.
* Module not found: Error: Can't resolve 'os' in '/home/jdanek/repos/qpid/qpid-dispatch/console/react/node_modules/rhea/lib'
* https://github.com/facebook/create-react-app/issues/11756
* downgraded and filled https://github.com/amqp/rhea/issues/379