debugger: First slight pass at UI (#27034)

- Collapse Launch and Attach into a single split button
- Fix code actions indicator being colored red.

Release Notes:

- N/A

crates/editor/src/editor.rs

@@ -5918,11 +5918,7 @@ impl Editor {
         breakpoint: Option<&(Anchor, Breakpoint)>,
         cx: &mut Context<Self>,
     ) -> Option<IconButton> {
-        let color = if breakpoint.is_some() {
-            Color::Debugger
-        } else {
-            Color::Muted
-        };
+        let color = Color::Muted;
 
         let position = breakpoint.as_ref().map(|(anchor, _)| *anchor);
         let bp_kind = Arc::new(