Allow site-admins to determine the system groups in Global permissions page

Issue Summary

There are several default system groups added in Global permissions
i.e
Administrators, atlassian-addons-admin, system-administrators and trusted-users-<number>

The intention for the request is, as the site admins of instance, need to make sure who should have the permission to access the site. They have also grouped users so that it can add the corresponding groups on the Global Permission page.
However, there are some system groups that don't use and even cannot find them, which makes us worry about there might cause security breach in the worst case.

Notes

Access Global permissions in Jira/Confluence and we can see the default system groups. This should be hidden or given ability to site-admins to remove the group

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available