The project group under which collection will appear in selection drop down menu on main Administration page.
Can be set in: profile.cfg, collection.cfg
Notes: This option is used by both collections and profiles.
This setting groups collections under a single project in the administration UI. This setting is tied to customer groups, collections must also be in the same customer group to be in the same project group.
group.project_id can include alphanumeric characters as well as dash ('-'), underscore ('_')
and space (' ') characters.