fix permadiff with new access approval cloud product mappings

[modular-magician]

Fixes hashicorp/terraform-provider-google#7432

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Release Note Template for Downstream PRs (will be copied)

accessapproval: fixed issue where, due to a recent API change, `google_*_access_approval.enrolled_services.cloud_product` entries specified as a URL would result in a permadiff

Derived from GoogleCloudPlatform/magic-modules#4065