[api] rework /statistics/latest_updates

More because I can - it's from 37ms to 11ms, which doesn't really matter :)
[api] StatusController#workerstatus had a average runtime of 488ms

Which is completely insane as the webui calls it every couple of seconds.
But it was loading all projects currently building in memory only to check
if they are hidden - removed and we're down to 28ms
[dist] update gem versions and add optional newrelic_rpm