Introduce new Kubernetes spec helpers

What does this MR do?

We're trying to split !22011 (merged) into multiple and smaller MR0s, since it's too big and hard to review. This MR introduces new Kubernetes spec helpers that are going to be used by !22011 (merged)

Does this MR meet the acceptance criteria?

• [-] 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