Update gitaly servers card to CrudComponent

What does this MR do and why?

• Updates CardComponent to CrudComponent
• Moves tracking into PageHeadingComponent

Screenshots or screen recordings

Before	After

How to set up and validate locally

http://127.0.0.1:3000/admin/gitaly_servers

Links

• ✂️ UX Paper Cuts 17.3 → Dark mode - Design Support (#452231 - closed)