Remove Redux Toolkit Import

Remove the Redux toolkit from the legacy store initialization. The toolkit import will be in a different set of files after the store's rewrite has been completed.

User-Interface/src/store/configureStore.ts

@@ -2,7 +2,6 @@
 // Licensed under the MIT license.
 
 import { createStore, applyMiddleware } from 'redux';
-import { configureStore } from "@reduxjs/toolkit";
 import thunk from 'redux-thunk';
 import { appReducer } from './reducers/appReducer';