Made project_service.service validation reject invalid service domains

[modular-magician]

Resolved hashicorp/terraform-provider-google#8875

There are a variety of supported domains (and more may be added). I think adding a simple check for the domain being plausible (i.e. "does it contain a period") should catch simple typos like the one in the linked issue while also being future-proof.

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Release Note Template for Downstream PRs (will be copied)

serviceusage: Made `google_project_service.service` validation reject invalid service domains that don't contain a period

Derived from GoogleCloudPlatform/magic-modules#4722