samples(compute): add moving instances samples [do not merge]

[FrodoTheTrue]

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 8 region tags.

• compute/disks/create_disk_from_snapshot.go:17, tag compute_disk_create_from_snapshot
• compute/disks/create_empty_disk.go:17, tag compute_disk_create_empty_disk
• compute/disks/delete_disk.go:17, tag compute_disk_delete
• compute/disks/set_disk_autodelete.go:17, tag compute_disk_autodelete_change
• compute/get_instance.go:17, tag compute_instances_get
• compute/instances/create-start-instance/create_instance_with_existing_disks.go:17, tag compute_instances_create_with_existing_disks
• compute/snapshots/create_snapshot.go:17, tag compute_snapshot_create
• compute/snapshots/delete_snapshot.go:17, tag compute_snapshot_delete

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[FrodoTheTrue]

Sure, this PR is just a WIP. I have splitted this PR into 3 parts and fixed your comments. We could jump into them for more detailed comments, if neded:

1. Disks samples: https://github.com/GoogleCloudPlatform/golang-samples/pull/2628
2. Snapshots samples: https://github.com/GoogleCloudPlatform/golang-samples/pull/2629
3. Samples for moving instances doc: https://github.com/GoogleCloudPlatform/golang-samples/pull/2630

[codyoss]

@FrodoTheTrue Can we close this?

[FrodoTheTrue]

yep, sure