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/project_symbols/src/project_symbols.rs

@@ -252,8 +252,10 @@ impl PickerDelegate for ProjectSymbolsDelegate {
                     v_flex()
                         .child(
                             LabelLike::new().child(
-                                StyledText::new(label)
-                                    .with_highlights(&window.text_style().clone(), highlights),
+                                StyledText::new(label).with_default_highlights(
+                                    &window.text_style().clone(),
+                                    highlights,
+                                ),
                             ),
                         )
                         .child(Label::new(path).color(Color::Muted)),