Add GCP persistent disk ID to metadata of pkb

For this task, we want to store the disk ID in the disk metadata.

TASK:

Add a method in CreatePDDiskStrategy https://github.com/GoogleCloudPlatform/PerfKitBenchmarker/blob/master/perfkitbenchmarker/providers/gcp/gce_disk_strategies.py#L56C7-L56C27 called UpdateDiskIDs

In UpdateDiskIDs, iterate through self.remote_disk_groups, then iterate through each disk in the disk group using nested for loop.

for each disk, call self.Describe to get the description json, parse the disk id from the json and add it as a field to disk. i.e. disk.id = 12345

For this task, we will need to provision a disk as well. We can use fio benchmark:

command: ./pkb.py --benchmarks=fio --data_disk_size=10 --data_disk_type=pd-ssd