Add user-visible output for remote operations (#25849)

This PR adds toasts for reporting success and errors from remote git
operations. This PR also adds a focus handle to notifications, in
anticipation of making them keyboard accessible.

Release Notes:

- N/A

---------

Co-authored-by: julia <julia@zed.dev>

crates/extensions_ui/src/extension_suggest.rs

@@ -168,11 +168,14 @@ pub(crate) fn suggest(buffer: Entity<Buffer>, window: &mut Window, cx: &mut Cont
         );
 
         workspace.show_notification(notification_id, cx, |cx| {
-            cx.new(move |_cx| {
-                MessageNotification::new(format!(
-                    "Do you want to install the recommended '{}' extension for '{}' files?",
-                    extension_id, file_name_or_extension
-                ))
+            cx.new(move |cx| {
+                MessageNotification::new(
+                    format!(
+                        "Do you want to install the recommended '{}' extension for '{}' files?",
+                        extension_id, file_name_or_extension
+                    ),
+                    cx,
+                )
                 .primary_message("Yes, install extension")
                 .primary_icon(IconName::Check)
                 .primary_icon_color(Color::Success)