Support Gitlab repositories for working groups

As discussed via email we would like to enable working groups to be provisioned Gitlab repos to support collaboration. We now have a working group (IDE Platform) who has specifically asked for this capability, so we would like to get to this sooner than later. I think a few things that need to get done here are:

• rename the current "Eclipse" top-level group to "Eclipse Projects"
• create a top-level group "Eclipse Working Groups"
• provision repos upon request. Establishing a process to do this (perhaps via Gitlab here) would be required as well Happy to answer any questions! /cc @wbeaton @droy