feat: a quota budget should be able to be specified for the Everyone group

Version: [`v0.18.1+e3a4861`](https://github.com/coder/coder/commit/e3a4861e93341ac37b58f4115dc51ce28b61feae)

Many customers do not implement groups, but need the quotas feature.

Right now, the Everyone group is not visible to edit settings and add a quota budget. It should be.