Really grateful for the work cassaundra did to get this in! A part of the cargo-remove work that didn't make it into 1.66 is that cargo-remove will garbage col

Really grateful for the work cassaundra did to get this in! A part of the cargo-remove work that didn't make it into 1.66 is that cargo-remove will garbage collect references to the remove dependency. For example, if you remove the last reference to a `workspace.dependency`, it'll automatically remove the workspace entry for you! The original RFC for `workspace.dependency` declared having an unused entry an error but we didn't think it was worth the implementation cost / runtime overhead and now we can automatically clean it up!