Updated Red Hat mounts for air-gapped clusters

[JunAr7112]

Description

This change is in response to this issue. In summary, when we install the gpu-operator on an air-gapped cluster the driver pod spec can error because the node does not have the HostPathFile.

MountVolume.SetUp failed for volume "subscription-config-1" : hostPath type check failed: /etc/yum.repos.d/redhat.repo is not a file Warning FailedMount 3m55s (x23 over 34m) kubelet MountVolume.SetUp failed for volume "subscription-config-0" : hostPath type check failed: /etc/pki/entitlement is not a directory

When we set up the gpu-operator to run in air-gapped environments (see here), we will setup a local package repository containing the the Red Hat packages needed to run, and create a configMap referencing a repo list containing the packages. In a regular environment, the driver container uses Ret Hat Subscription Management (RHSM) to determine what repos you need and how to install them from Red Hat's CDN. With a repoConfig ConfigMap (air-gapped / custom mirror): you do not rely on that subscription path for package location. The ConfigMap will provide the server/files where the Driver can pull the repos. Therefore, the operator can skip RHSM mounts because the repo definitions and mirror content are already provided.

The following changes were made:

// Custom repo ConfigMap supplies yum repos in offline/air-gapped installs. Skip mounting host RHSM paths when using a custom repo ConfigMap if cr.Spec.IsRepoConfigEnabled() && pool.osRelease == "rhel" { pathToVolumeSource = map[string]corev1.VolumeSource{} }
...ensuring that we no longer mount the RHSM paths.

Checklist

• No secrets, sensitive information, or unrelated changes
• Lint checks passing (make lint)
• Generated assets in-sync (make validate-generated-assets)
• Go mod artifacts in-sync (make validate-modules)
• Test cases are added for new code paths

Testing

An Air-gapped cluster was setup following instructions here: https://kubernetes.io/blog/2023/10/12/bootstrap-an-air-gapped-cluster-with-kubeadm/.

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