[Test] test_patching_cluster: fix kernel pinning for RHEL and Fix and stabilize checks for kernel modules

[gmarciani]

Description of changes

In test_patching_cluster, fix kernel pinning for RHEL and Fix and stabilize checks for kernel modules.
fix kernel pinning on RHEL (with the previous pinning some kernel packages could escape the pinning. Also, fixed the checks on kernel modules to prevent false alarms. Now the test fails the kernel module verification if a mandatory kernel module is not loaded, OR the module is not loaded (may be lazily loaded), but it exists and fails to load. In this way we prevent the false alarms on kernel modules that legitimately do not exist anymore on the new kernel.

Tests

SUCCESS

test-suites:
  patching:
    test_patching.py::test_patching_cluster:
      dimensions:
        - regions: [{{ g4dn_8xlarge_CAPACITY_RESERVATION_2_INSTANCES_2_HOURS_NOPG_ubuntu2404 }}]
          instances: ["g4dn.8xlarge"]
          oss: [{{ UBUNTU_OS_X86_0 }}]
          schedulers: ["slurm"]
          flags: ["patching:full-capped"]
        - regions: [{{ g4dn_8xlarge_CAPACITY_RESERVATION_2_INSTANCES_2_HOURS_NOPG_rhel9 }}]
          instances: ["g4dn.8xlarge"]
          oss: [{{ RHEL_OS_X86_0 }}]
          schedulers: ["slurm"]
          flags: ["patching:full-capped"]
        - regions: [{{ g4dn_8xlarge_CAPACITY_RESERVATION_2_INSTANCES_2_HOURS_NOPG_alinux2023 }}]
          instances: ["g4dn.8xlarge"]
          oss: ["alinux2023"]
          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.