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/ui/src/components/icon.rs

@@ -237,6 +237,7 @@ pub enum IconName {
     Menu,
     MessageBubbles,
     MessageCircle,
+    Cloud,
     Mic,
     MicMute,
     Microscope,

crates/ui/src/components/label/highlighted_label.rs

@@ -126,6 +126,6 @@ impl RenderOnce for HighlightedLabel {
         text_style.color = self.base.color.color(cx);
 
         self.base
-            .child(StyledText::new(self.label).with_highlights(&text_style, highlights))
+            .child(StyledText::new(self.label).with_default_highlights(&text_style, highlights))
     }
 }