collab ui: Dismiss project shared notifications when leaving room (#10160)

When leaving a call/room in which a project was shared, the shared
project notification was not getting dismissed when the person that
shared the project left the room.
Although there was a `cx.emit(Event::Left)` call inside room, the event
was never received in the `project_shared_notification` module, because
the room is dropped before the event can be dispatched. Moving the
`cx.emit(Event::Left)` to the active call fixed the problem. Also
renamed `Event::Left` to `Event::RoomLeft` because the room join
equivalent is also called `Event::RoomJoined`.


Release Notes:

- Fixed project shared notification staying open, when the user that
shared the project left the room

crates/collab_ui/src/chat_panel.rs

@@ -156,7 +156,7 @@ impl ChatPanel {
                             }
                         }
                     }
-                    room::Event::Left { channel_id } => {
+                    room::Event::RoomLeft { channel_id } => {
                         if channel_id == &this.channel_id(cx) {
                             cx.emit(PanelEvent::Close)
                         }

crates/collab_ui/src/notifications/project_shared_notification.rs

@@ -58,7 +58,7 @@ pub fn init(app_state: &Arc<AppState>, cx: &mut AppContext) {
             }
         }
 
-        room::Event::Left { .. } => {
+        room::Event::RoomLeft { .. } => {
             for (_, windows) in notification_windows.drain() {
                 for window in windows {
                     window