Updating a graph with existing versions forever renders the resources read-only

[aarongundel]

Updating a graph with existing versions forever renders the resources read-only.

Add a new resource.
Add a new version to its graph.
Attempt to edit that resource. You will see the following error message, regardless of whether or not you are logged in as an admin.

See also https://github.com/archesproject/arches/blob/dev/8.0.x/arches/app/views/resource.py#L407