Add iap.enabled to google_compute_region_backend_service

[c2thorn]

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Description

Region Backend Service has a custom encoder to force send the iap block with iap.enabled = false if it doesn't exist in config: https://github.com/GoogleCloudPlatform/magic-modules/blob/main/mmv1/templates/terraform/encoders/region_backend_service.go.erb#L15

This is causing a customer issue: b/310147789 With this encoder, the provider does not surface the iap.enabled field to users. This is additionally not correct because users should be allowed to send iap.enabled = false with other fields in the iap block configured.

https://github.com/GoogleCloudPlatform/magic-modules/pull/9581 fixes this by adding iap.enabled as a required field. This would be a breaking change, and we may consider a state upgrader to add the field for existing resources in the next major release.

New or Affected Resource(s)

• google_compute_region_backend_service

Potential Terraform Configuration

References

b/310147789 https://github.com/GoogleCloudPlatform/magic-modules/pull/9581

[melinath]

Whatever happens for this should likely be replicated in google_compute_backend_service (the non-regional variant) so that they behave consistently. https://github.com/hashicorp/terraform-provider-google/issues/16585 tracks that request as well.

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