Let's move the nautilus properties plug-in into nautilus git repo
I think core GNOME modules should not be shipping with a nautilus plug-in, because it's not included in the Nightly flatpak of Files and, as a result:
- The application as developed and tested by its maintainers looks and behaves differently from the application as released by the release team.
- The application CI pipeline is not going to warn us if we break core plug-ins on any MR. We already have a few in-tree plug-ins which originated in other modules.