[Test] Fix test_patching_cluster on Ubuntu by DEBIAN_FRONTEND=noninteractive and improve logging to facilitate troubleshooting

[gmarciani]

Description of changes

Fix test_patching_cluster on Ubuntu by DEBIAN_FRONTEND=noninteractive and improve logging to facilitate troubleshooting

Also patching a minor bug on cluster stack deletion caused by missing import.

Tests

SUCCEEDED on Ubuntu. On RHEL9 it fails for known issue on lustre module broken by kernel bump.

test-suites:
  patching:
    test_patching.py::test_patching_cluster:
      dimensions:
        - regions: [{{ g4dn_8xlarge_CAPACITY_RESERVATION_3_INSTANCES_2_HOURS_NOPG_ubuntu2404 }}]
          instances: ["g4dn.8xlarge"]
          oss: ["ubuntu2404"]
          schedulers: ["slurm"]
          flags: ["patching:full"]
        - regions: [{{ g4dn_8xlarge_CAPACITY_RESERVATION_3_INSTANCES_2_HOURS_NOPG_rhel9 }}]
          instances: ["g4dn.8xlarge"]
          oss: ["rhel9"]
          schedulers: ["slurm"]
          flags: ["patching:full"]

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.