Fix Auto DevOps QA Smoke test hidden banner

What does this MR do?

The banner is no longer being shown for empty repos since https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/26024 . We could have made this assertion after pushing the repo but this is not the kind of thing that really needs to be in an integration or smoke test as it is already tested in spec/features/projects/show/user_interacts_with_auto_devops_banner_spec.rb

What are the relevant issue numbers?

Does this MR meet the acceptance criteria?

• [-] Changelog entry added, if necessary
• [-] Documentation created/updated via this MR
• [-] Documentation reviewed by technical writer or follow-up review issue created
• [-] Tests added for this feature/bug
• [-] Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• [-] Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer

Closes https://gitlab.com/gitlab-org/quality/nightly/issues/87