Backport fixes for pipelines_store frontend specs

What does this MR do?

Backports some build failure fixes from gitlab-ee!1190

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

All tests should pass

Why was this MR needed?

The previous attempt to fix this transient error within pipelines_store apparently did not fix the problem. (!9057 (merged))

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• [ ] Changelog entry added
• [ ] Documentation created/updated
• [ ] API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #27871 (closed)