fix permadiff thrashing

[modular-magician]

Fixes hashicorp/terraform-provider-google#13157

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Release Note Template for Downstream PRs (will be copied)

container: fixed GKE permadiff/thrashing when `update_settings. max_surge` or `update_settings. max_unavailable` values are updating on `google_container_node_pool`

Derived from GoogleCloudPlatform/magic-modules#6908