Rename participants to guests in proto

Co-Authored-By: Nathan Sobo <nathan@zed.dev>

server/src/rpc.rs

@@ -1947,10 +1947,7 @@ mod tests {
                         .map(|w| {
                             (
                                 w.root_name.as_str(),
-                                w.participants
-                                    .iter()
-                                    .map(|p| p.github_login.as_str())
-                                    .collect(),
+                                w.guests.iter().map(|p| p.github_login.as_str()).collect(),
                             )
                         })
                         .collect();

server/src/rpc/store.rs

@@ -204,7 +204,7 @@ impl Store {
                 host.worktrees.push(proto::WorktreeMetadata {
                     root_name: worktree.root_name.clone(),
                     is_shared: worktree.share().is_ok(),
-                    participants: guests.into_iter().collect(),
+                    guests: guests.into_iter().collect(),
                 });
             }
         }