Use the `stub_licensed_features` helper in specs
This uses an existing helper to stub licensed features.
- [-] Changelog entry added, if necessary
- [-] Documentation created/updated
- [-] Tests added for this feature/bug
- [-] Conforms to the code review guidelines
- [-] Conforms to the merge request performance guidelines
- [-] Conforms to the style guides
- [-] Conforms to the database guides
- [-] EE specific content should be in the top level
/ee
folder - [-] For a paid feature, have we considered GitLab.com plans, how it works for groups, and is there a design for promoting it to users who aren't on the correct plan?