Collapsible folders

[AlistairHardy]

Is your feature request related to a problem? Please describe. The problem is when you start scaling this out for large quantities of servers (if you look after Bamboo \ Jenkins infra, this can happen). It can get a bit silly with the amount of scrolling to do.

Describe the solution you'd like To have it so the folders can be automatically collapsed on start, and using the right have arrow (or clicking on the folder) expand it.