debugger: Add close button and coloring to debug panel session's menu (#28310)

This PR adds colors to debug panel's session menu that indicate the
state of each respective session. It also adds a close button to each
entry.

green - running
yellow - stopped
red - terminated/ended 


Release Notes:

- N/A

crates/project/src/debugger/session.rs

@@ -832,7 +832,12 @@ pub enum SessionEvent {
     Threads,
 }
 
+pub(crate) enum SessionStateEvent {
+    Shutdown,
+}
+
 impl EventEmitter<SessionEvent> for Session {}
+impl EventEmitter<SessionStateEvent> for Session {}
 
 // local session will send breakpoint updates to DAP for all new breakpoints
 // remote side will only send breakpoint updates when it is a breakpoint created by that peer
@@ -1553,6 +1558,8 @@ impl Session {
             )
         };
 
+        cx.emit(SessionStateEvent::Shutdown);
+
         cx.background_spawn(async move {
             let _ = task.await;
         })