azurerm_app_service_certificate - introduce argument app_service_plan_id for usage with ASE

[haraldatbmw]

This PR introduces the argument app_service_plan_id to the resource azurerm_app_service_certificate and changes the attribute hosting_environment_profile_id to be computed.

The Azure SDK attribute hostingEnvironmentProfile is read-only and was never part of the REST API call for create or update a app_service_certificate.
Azure SDK for go: https://github.com/Azure/azure-sdk-for-go/blob/main/services/web/mgmt/2020-06-01/web/models.go#L7124
Azure REST API: https://github.com/Azure/azure-rest-api-specs/blob/master/specification/web/resource-manager/Microsoft.Web/stable/2020-06-01/Certificates.json#L395

The new argument app_service_plan_id maps to the Azure SDK attribute serverFarmId which is required if an app-service-environment is in place.
Azure REST API: https://github.com/Azure/azure-rest-api-specs/blob/master/specification/web/resource-manager/Microsoft.Web/stable/2020-06-01/Certificates.json#L430

fixes #11771

[haraldatbmw]

@jackofallops Please proceed your review here.

[favoretti]

@haraldatbmw LGTM, still one of the maintainers needs to approve/have a look.

[adamyager]

@favoretti are you able to approve this? Would be great to have this in the upcoming milestone. This has been broke for some time.

[favoretti]

@adamyager I'm sorry - I can't. But I see that @katbyte added it to the next release milestone.

[adamyager]

@adamyager I'm sorry - I can't. But I see that @katbyte added it to the next release milestone.

I do see that. I appreciate it all!

[jackofallops]

Tests are looking good

[jackofallops]

Thanks @haraldatbmw - apologies for the delay in approval, this LGTM 👍

[github-actions]

This functionality has been released in v2.76.0 of the Terraform Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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[github-actions]

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