Add "usingNewReviewPanel" flag in store (#21279)

* Revert "Add isUsingNewReviewPanel flag for writefull (#21111)"

This reverts commit 3491e93ca70fa1db0c751872e233dfebdbe81423.

* add usingNewReviewPanel in store

* fix lint error

GitOrigin-RevId: 56d90a428a2cc45708b8b483dc60a62aae233a85

services/web/frontend/js/features/ide-react/scope-adapters/review-panel-context-adapter.ts

@@ -1,7 +1,9 @@
 import { ReactScopeValueStore } from '@/features/ide-react/scope-value-store/react-scope-value-store'
+import { isSplitTestEnabled } from '@/utils/splitTestUtils'
 
 export default function populateReviewPanelScope(store: ReactScopeValueStore) {
   store.set('loadingThreads', true)
   store.set('users', {})
   store.set('addNewComment', () => {})
+  store.set('usingNewReviewPanel', isSplitTestEnabled('review-panel-redesign'))
 }