TP: make server rows in cache stats page link to server

[dangogh]

any row in the cache stats page (https://trafficportal.example.test/#!/cache-stats) that is specific to a server should allow the user to jump to that server's page with a click.

This is already true of the cache checks page (https://trafficportal.example.test/#!/cache-checks), so should be straightforward...

[mitchell852]

https://trafficportal.example.test/#!/cache-checks calls api/1.4/servers/checks which has the cache id in the response. The id is used to navigate to the server page. i.e. https://tp.example.test/#!/servers/4304

https://trafficportal.example.test/#!/cache-stats calls api/1.4/caches/stats which has no ID field which makes it tougher. Maybe not a great "first issue". I'm going to remove that label.