[Test] [historyserver] [collector] Enhance log file coverage test for both head and worker pods

historyserver/config/rayjob.yaml

@@ -6,6 +6,7 @@ spec:
   entrypoint: |
     python -c "
     import ray
+    import time
     ray.init()
 
     @ray.remote(num_cpus=0.5)
@@ -35,6 +36,10 @@ spec:
     final_count = ray.get(counter.get_count.remote())
     print(f'Final count: {final_count}')
     print(f'Cluster resources: {ray.cluster_resources()}')
+
+    # For now, events on the worker nodes aren't sent to the collector when calling ray.shutdown().
+    # As a workaround, we explicitly wait for 5 seconds to ensure events are sent.
+    time.sleep(5)
     "
   # Select the existing Ray cluster running the collector.
   clusterSelector: