add server-side id for a few resources

[modular-magician]

closes hashicorp/terraform-provider-google#20223

Release Note Template for Downstream PRs (will be copied)

See Write release notes for guidance.

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

[conventional-commit-lint-gcf]

🤖 I detect that the PR title and the commit message differ and there's only one commit. To use the PR title for the commit history, you can use Github's automerge feature with squashing, or use automerge label. Good luck human!

-- conventional-commit-lint bot
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