(GCP): Add an ability to change the destination AZ while restoring.

[tuusberg]

Describe the problem/challenge you have

We are using Velero to restore volumes from our production cluster that spans across multiple AZs to our dev cluster which is single-AZ for costs reasons. We tried using a StorageClass with topology constraints but it didn't work because the plugin always uses the source AZ when it creates volumes from volume snapshots. We need a way to override the default AZ for restores to dev cluster.

More than happy to open a PR as I believe I know how to add this functionality to the plugin with a few lines of code.

Describe the solution you'd like

A possible solution would be:

1. Configure the AZ override via plugin configuration.
2. Check for the override inside CreateVolumeFromSnapshot method and replace volumeAZ value with the one provided by user.

Anything else you would like to add:

Environment:

• Velero version (use velero version): 1.14
• Kubernetes version (use kubectl version): v1.29.7-gke.1104000
• Kubernetes installer & version:
• Cloud provider or hardware configuration: GKE
• OS (e.g. from /etc/os-release): Container-Optimized OS with containerd

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