Remove custom virtual env

Remove custom virtual from the UI.

Also, surface missing-resource warnings on list items for UJTs that were using
custom virtualenvs.

Fix some uni-tests warnings.

See: https://github.com/ansible/awx/issues/9190
Also: https://github.com/ansible/awx/issues/9207

awx/ui_next/src/components/AppContainer/AppContainer.test.jsx

@@ -11,14 +11,12 @@ jest.mock('../../api');
 
 describe('<AppContainer />', () => {
   const ansible_version = '111';
-  const custom_virtualenvs = [];
   const version = '222';
 
   beforeEach(() => {
     ConfigAPI.read.mockResolvedValue({
       data: {
         ansible_version,
-        custom_virtualenvs,
         version,
       },
     });