WIP: Consolidate kubernetes stub calls in specs

What does this MR do?

Reduces duplication on Kubernetes stub calls across specs

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/55764

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 #55764 (moved)

To do

• Simplify the spec helpers