Add support GRPC for google_compute_(region)_backend_service.protocol

[edwardmedia]

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Description

Currently GRPC is excluded in the enum validation for protocol field in both resources. It is now required by #7116
https://cloud.google.com/compute/docs/reference/rest/v1/backendServices
https://cloud.google.com/compute/docs/reference/rest/v1/regionBackendServices

New or Affected Resource(s)

• google_compute_backend_service
• google_compute_region_backend_service

Potential Terraform Configuration

# Propose what you think the configuration to take advantage of this feature should look like.
# We may not use it verbatim, but it's helpful in understanding your intent.

References

• #0000

[ghost]

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