Dashboard: Only fetch last n log lines

[eysi09]

Problem

Currently the dashboard fetches all logs for all services, which doesn't scale very well. The cli uses kubectl for getting logs that aren't tailed, in which case we can use --tail=n to get the last n lines. It doesn't look we can paginate the logs though.

Suggested solution

Decide on a max number of lines to fetch, say n, and divide by number of services, so that we get n/numServices log lines per service. When selecting a single service, fetch all n log lines for that service. Notify the user that they can use the CLI to tail logs for very large outputs.