Label archived projects as such in the project management listing

[jwodder]

Now that Warehouse users can archive projects, I've started archiving my abandoned projects. However, the listing of my projects at https://pypi.org/manage/projects/ doesn't indicate that a given project has been archived once I've archived it, and the only page under https://pypi.org/manage/project/{project_name}/ that does indicate archival status is the "Settings" page, where the "Unarchive project" button is now activated. It would be helpful if an "Archived" label (similar to the current "Sole Owner" label) were added to the project listing page and if some sort of label or banner were added to the management pages for individual archived projects.

[miketheman]

Good idea!
cc @facutuesca

[facutuesca]

PR open here: #17438