Differentiate between follow state on a per-project basis

crates/collab/src/db.rs

@@ -1996,6 +1996,7 @@ impl Database {
             followers.push(proto::Follower {
                 leader_id: Some(db_follower.leader_connection().into()),
                 follower_id: Some(db_follower.follower_connection().into()),
+                project_id: db_follower.project_id.to_proto(),
             });
         }