[Release-3.14.1][Test] Add integration test for the fixes of issues caused by cluster update and rollback failure (#7150)

Add integration test to verify the following fixes work correctly:
- [F1] clustermgtd remains running after both update and rollback fail
   (expected when failure occurs after slurm reconfiguration, which is the safe section)
- [F2] cfn-hup does not enter an endless loop after rollback to a state older than 24h
- [F3] dna.json files are cleaned up after update and rollback failure

Test scenario:
1. Create cluster with 3 static compute nodes
2. Inject cfn-signal failure on head node (simulating expired wait condition)
3. Disable cfn-hup on CN1 before update (causes update to fail)
4. Trigger cluster update (add new queue)
5. Wait for CN2 to apply update, then disable its cfn-hup
6. Update fails (CN1 didn't update), rollback fails (CN2 won't rollback)
7. Verify: clustermgtd running, dna.json cleaned up, CN3 has correct config version, metadata_db.json updated, no cfn-hup endless loop

Author: hehe7318

tests/integration-tests/configs/develop.yaml

@@ -825,6 +825,12 @@ test-suites:
           instances: {{ common.INSTANCES_DEFAULT_X86 }}
           oss: [{{ OS_X86_3 }}]
           schedulers: ["slurm"]
+    test_update_rollback_failure.py::test_update_rollback_failure:
+      dimensions:
+        - regions: ["us-east-1"]
+          instances: {{ common.INSTANCES_DEFAULT_X86 }}
+          oss: [{{ OS_X86_2 }}]
+          schedulers: ["slurm"]
   users:
     test_default_user_home.py::test_default_user_local_home:
       dimensions: