Fix dev server projects reconnect (#13484)

Release Notes:

- Improved handling of client reconnects for dev-servers (alpha group
only)

crates/collab/src/rpc/connection_pool.rs

@@ -73,6 +73,7 @@ impl ConnectionPool {
     pub fn reset(&mut self) {
         self.connections.clear();
         self.connected_users.clear();
+        self.connected_dev_servers.clear();
         self.channels.clear();
     }