add server-side id for a few resources

[modular-magician]

closes hashicorp/terraform-provider-google#20223

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compute: added server generated id as `forwarding_rule_id` to `google_compute_global_forwarding_rule`

compute: added server generated id as `health_check_id` to `google_region_health_check`

compute: added server generated id as `instance_group_manager_id` to `google_region_instance_group_manager`

compute: added server generated id as `instance_group_manager_id` to `google_instance_group_manager`

compute: added server generated id as `network_endpoint_id` to `google_region_network_endpoint`

compute: added server generated id as `subnetwork_id` to `google_subnetwork`

Derived from GoogleCloudPlatform/magic-modules#12351