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/rich_text/src/rich_text.rs

@@ -96,7 +96,7 @@ impl RichText {
 
         InteractiveText::new(
             id,
-            StyledText::new(self.text.clone()).with_highlights(
+            StyledText::new(self.text.clone()).with_default_highlights(
                 &window.text_style(),
                 self.highlights.iter().map(|(range, highlight)| {
                     (