Driver custom repo configmap fix

[Shivkumar13]

Description

Fixes #562

Changed the getRepoConfigPath() working to use the OS version labels from GPU worker nodes (added by NFD) when determining what OS-specific paths to use for repository configuration files. As per current implementation, for the GPU stack we only check for OS version labels on GPU nodes but for injecting custom ConfigMap we are using /etc/os-release on the current operator node.

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

[copy-pr-bot]

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