Use buffer font when rendering editor breadcrumbs and diagnostics (#10488)

Before:

<img width="592" alt="Screenshot 2024-04-12 at 12 00 00 PM"
src="https://github.com/zed-industries/zed/assets/2280405/3251743e-4f2c-4ca3-9bc5-88f37660f7b9">

After:

<img width="673" alt="Screenshot 2024-04-12 at 12 11 37 PM"
src="https://github.com/zed-industries/zed/assets/2280405/6a8ac597-261a-45d9-bf2a-a673b6f26b0e">


Release Notes:

- N/A

crates/breadcrumbs/src/breadcrumbs.rs

@@ -52,12 +52,19 @@ impl Render for Breadcrumbs {
                 Some(BreadcrumbText {
                     text: "⋯".into(),
                     highlights: None,
+                    font: None,
                 }),
             );
         }
 
         let highlighted_segments = segments.into_iter().map(|segment| {
             let mut text_style = cx.text_style();
+            if let Some(font) = segment.font {
+                text_style.font_family = font.family;
+                text_style.font_features = font.features;
+                text_style.font_style = font.style;
+                text_style.font_weight = font.weight;
+            }
             text_style.color = Color::Muted.color(cx);
 
             StyledText::new(segment.text.replace('\n', "␤"))