Close all tabs and always load first container when initializing Fabric (#2014)

Co-authored-by: Laurent Nguyen <languye@microsoft.com>

src/hooks/useTabs.ts

@@ -42,6 +42,7 @@ export interface TabsState {
   selectLeftTab: () => void;
   selectRightTab: () => void;
   closeActiveTab: () => void;
+  closeAllTabs: () => void;
   persistTabsState: () => void;
 }
 
@@ -237,6 +238,9 @@ export const useTabs: UseStore<TabsState> = create((set, get) => ({
       state.closeTab(state.activeTab);
     }
   },
+  closeAllTabs: () => {
+    set({ openedTabs: [], openedReactTabs: [], activeTab: undefined, activeReactTab: undefined });
+  },
   persistTabsState: () => {
     const state = get();
     const openTabsStates = state.openedTabs.map((tab) => tab.getPersistedState());