Geo: Only display Geo-specific clone instructions button in a Geo Secondary node

What does this MR do?

Only display Geo-specific clone instructions button in a Geo Secondary node

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ee/issues/10398

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides

Closes #10398 (closed)