Navigation: share logic between buildBreadcrumbs and usePageTitle (#58819)

* simplify usePageTitle logic a bit

* use buildBreadcrumbs logic in usePageTitle

* always add home item to navTree, fix some tests

* fix remaining unit tests

public/app/features/invites/SignupInvited.test.tsx

@@ -1,10 +1,12 @@
 import { render, screen, waitFor, within } from '@testing-library/react';
 import userEvent from '@testing-library/user-event';
 import React from 'react';
+import { Provider } from 'react-redux';
 
 import { getRouteComponentProps } from 'app/core/navigation/__mocks__/routeProps';
 
 import { backendSrv } from '../../core/services/backend_srv';
+import { configureStore } from '../../store/configureStore';
 
 import { SignupInvitedPage, Props } from './SignupInvited';
 
@@ -28,6 +30,7 @@ const defaultGet = {
 
 async function setupTestContext({ get = defaultGet }: { get?: typeof defaultGet | null } = {}) {
   jest.clearAllMocks();
+  const store = configureStore();
 
   const getSpy = jest.spyOn(backendSrv, 'get');
   getSpy.mockResolvedValue(get);
@@ -43,7 +46,11 @@ async function setupTestContext({ get = defaultGet }: { get?: typeof defaultGet
     }),
   };
 
-  render(<SignupInvitedPage {...props} />);
+  render(
+    <Provider store={store}>
+      <SignupInvitedPage {...props} />
+    </Provider>
+  );
 
   await waitFor(() => expect(getSpy).toHaveBeenCalled());
   expect(getSpy).toHaveBeenCalledTimes(1);