Decide whether to send all levels or just top levels of compute instance from template

[paddycarver]

We're currently only ForceSendFieldsing the top-level attributes for google_compute_instance_from_template. As we have an opportunity for breaking changes in 3.0.0, we should decide whether we want to keep doing that, or ForceSendFields all fields, so any field can be set to the empty value.

[ghost]

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