Fix spec failures in spec/lib/gitlab/git/gitlab_projects_spec.rb

What does this MR do?

Fix a couple of issues seen with the newly-introduced gitlab_projects specs

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Keep the test suite green

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Tests added for this feature/bug
• Review
• Has been reviewed by Backend
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered

What are the relevant issue numbers?

Closes #41264 (closed)