assistant2: Add context server list to configuration view (#27028)

This PR adds a context server list to the configuration view in
Assistant2:

<img width="1394" alt="Screenshot 2025-03-18 at 5 26 23 PM"
src="https://github.com/user-attachments/assets/58bf3920-1e35-4cb8-a32a-5ae9f98ce387"
/>

Release Notes:

- N/A

crates/assistant2/src/assistant_panel.rs

@@ -415,8 +415,11 @@ impl AssistantPanel {
     }
 
     pub(crate) fn open_configuration(&mut self, window: &mut Window, cx: &mut Context<Self>) {
+        let context_server_manager = self.thread_store.read(cx).context_server_manager();
+
         self.active_view = ActiveView::Configuration;
-        self.configuration = Some(cx.new(|cx| AssistantConfiguration::new(window, cx)));
+        self.configuration =
+            Some(cx.new(|cx| AssistantConfiguration::new(context_server_manager, window, cx)));
 
         if let Some(configuration) = self.configuration.as_ref() {
             self.configuration_subscription = Some(cx.subscribe_in(