Geo: Added a button to Admin UI > Geo Nodes to open Geo Projects screen of any secondary node

What does this MR do?

Adds a link in the Admin UI > Geo Nodes to open the list of existing projects and allow users to check the state of synchronization on that specific node.

This is the implementation of the following UX mockup:

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ee/issues/7126

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
• EE specific content should be in the top level /ee folder

Closes #7126 (closed)