skip setting disk_labels if disk_type is local-ssd

[abbas1902]

Before when redeploying running instance with local-ssd with no labels:

~/cluster-toolkit$ ./gcluster deploy hpc-slurm/
Testing if deployment group hpc-slurm/primary requires adding or changing cloud infrastructure
Deployment group hpc-slurm/primary requires adding or changing cloud infrastructure
Summary of proposed changes: Plan: 1 to add, 1 to change, 1 to destroy.

After:

~/cluster-toolkit$ ./gcluster deploy hpc-slurm/
Testing if deployment group hpc-slurm/primary requires adding or changing cloud infrastructure
Cloud infrastructure in deployment group hpc-slurm/primary is already applied
Collecting terraform outputs from hpc-slurm/primary
Deployment group primary contains no artifacts to export

###############################
Find instructions for cleanly destroying infrastructure and advanced manual
deployment instructions at:

hpc-slurm/instructions.txt

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