remote projects per user (#10594)

Release Notes:

- Made remote projects per-user instead of per-channel. If you'd like to
be part of the remote development alpha, please email hi@zed.dev.

---------

Co-authored-by: Bennet Bo Fenner <53836821+bennetbo@users.noreply.github.com>
Co-authored-by: Bennet <bennetbo@gmx.de>
Co-authored-by: Nate Butler <1714999+iamnbutler@users.noreply.github.com>
Co-authored-by: Nate Butler <iamnbutler@gmail.com>

crates/collab/src/rpc/connection_pool.rs

@@ -13,6 +13,7 @@ pub struct ConnectionPool {
     connected_users: BTreeMap<UserId, ConnectedPrincipal>,
     connected_dev_servers: BTreeMap<DevServerId, ConnectionId>,
     channels: ChannelPool,
+    offline_dev_servers: HashSet<DevServerId>,
 }
 
 #[derive(Default, Serialize)]
@@ -106,12 +107,17 @@ impl ConnectionPool {
             }
             PrincipalId::DevServerId(dev_server_id) => {
                 self.connected_dev_servers.remove(&dev_server_id);
+                self.offline_dev_servers.remove(&dev_server_id);
             }
         }
         self.connections.remove(&connection_id).unwrap();
         Ok(())
     }
 
+    pub fn set_dev_server_offline(&mut self, dev_server_id: DevServerId) {
+        self.offline_dev_servers.insert(dev_server_id);
+    }
+
     pub fn connections(&self) -> impl Iterator<Item = &Connection> {
         self.connections.values()
     }
@@ -137,7 +143,9 @@ impl ConnectionPool {
     }
 
     pub fn dev_server_status(&self, dev_server_id: DevServerId) -> proto::DevServerStatus {
-        if self.dev_server_connection_id(dev_server_id).is_some() {
+        if self.dev_server_connection_id(dev_server_id).is_some()
+            && !self.offline_dev_servers.contains(&dev_server_id)
+        {
             proto::DevServerStatus::Online
         } else {
             proto::DevServerStatus::Offline