[integ-test] [integ-test] Increase sleep time waiting for head node reboot from 240 to 300 seconds when running in US isolated regions

Signed-off-by: Hanwen <hanwenli@amazon.com>

Author: hanwen-cluster

tests/integration-tests/tests/common/utils.py

@@ -295,7 +295,7 @@ def reboot_head_node(cluster, remote_command_executor=None):
     wait_head_node_running(cluster)
     # Wait time is required for the head node to complete the reboot.
     # We observed that headnode in US isolated regions may take more time to reboot.
-    time.sleep(240 if "us-iso" in cluster.region else 120)
+    time.sleep(300 if "us-iso" in cluster.region else 120)
     logging.info(f"Rebooted head node for cluster: {cluster.name}")