fix(cli,chromium-runtime): clean up long-lived test runner resources after runs to prevent hanging processes

ts/tstest.classes.runtime.chromium.ts

@@ -277,6 +277,9 @@ export class ChromiumRuntimeAdapter extends RuntimeAdapter {
     }
 
     try {
+      for (const client of wss.clients) {
+        client.terminate();
+      }
       wss.close();
     } catch (error) {
       // WebSocket server might already be closed