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/breadcrumbs/src/breadcrumbs.rs

@@ -82,7 +82,7 @@ impl Render for Breadcrumbs {
             text_style.color = Color::Muted.color(cx);
 
             StyledText::new(segment.text.replace('\n', "⏎"))
-                .with_highlights(&text_style, segment.highlights.unwrap_or_default())
+                .with_default_highlights(&text_style, segment.highlights.unwrap_or_default())
                 .into_any()
         });
         let breadcrumbs = Itertools::intersperse_with(highlighted_segments, || {