debugger: Extend f5 binding to contextually rerun the last session (#31753)

Release Notes:

- Debugger Beta: if there is no stopped or running session, `f5` now
reruns the last session, or opens the new session modal if there is no
previously-run session.

crates/project/src/debugger/session.rs

@@ -2194,4 +2194,8 @@ impl Session {
             self.shutdown(cx).detach();
         }
     }
+
+    pub fn thread_state(&self, thread_id: ThreadId) -> Option<ThreadStatus> {
+        self.thread_states.thread_state(thread_id)
+    }
 }