NVIDIA / holodeck / 22147331291

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feat(templates): add RPM support to Kubernetes templates (#678)

* feat(templates): add RPM support to Kubernetes and containerd V2 templates

Add OS-family branching to Kubernetes templates for RPM-based
distributions (Rocky Linux, Amazon Linux, RHEL):

- kubeadmGitTemplate: Replace Debian-only build packages (g++,
  libc6-dev) with OS-aware case statement using RPM equivalents
  (gcc-c++, glibc-devel)
- kubeadmLatestTemplate: Same OS-family branching as git template
- microk8sTemplate: Add OS guard rejecting non-Debian systems with
  clear error (MicroK8s requires snap/Ubuntu)
- KubeadmConfig.IsUbuntu: Dynamic detection from env.Spec.Instance.OS
  instead of hardcoded true (backward compatible: defaults to true
  when OS is unset)
- containerdV2Template: Replace bare apt-get update with pkg_update
  abstraction

Follows the established case/HOLODECK_OS_FAMILY pattern from
containerd V1 template. All existing tests pass with zero regressions.

Signed-off-by: Carlos Eduardo Arango Gutierrez <eduardoa@nvidia.com>

* refactor: drop containerd V2 pkg_update change per Architect guidance

The containerdV2Template apt-get bug is a pre-existing issue in
containerd.go, not in kubernetes.go scope. Revert to keep this PR
focused on Kubernetes template changes only.

Signed-off-by: Carlos Eduardo Arango Gutierrez <eduardoa@nvidia.com>

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Signed-off-by: Carlos Eduardo Arango Gutierrez <eduardoa@nvidia.com>

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