Return creation_timestamp on compute instances and templates

[gtebbutt]

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Description

The creation_timestamp field is not currently returned on compute instance or template resources, but would be extremely useful in order to track resource changes - in this case to help with manual unique ID generation (see #15606 for deeper info on why that's important to us!)

New or Affected Resource(s)

• google_compute_instance
• google_compute_instance_template
• google_compute_instance_group
• google_compute_instance_group_manager
• google_compute_instance_from_machine_image
• google_compute_instance_from_template

References

• google_compute_instance_from_template does not set instance-template metadata #15606

b/312433434
b/312432924
b/312433243