r/azurerm_api_management_api_subscription: support for api_id

[patst]

Fixes #12016 .

Enables the configuration of subscriptions per API.

The test passed:

make testacc TEST='./azurerm/internal/services/apimanagement/api_management_subscription_resource_test.go' TESTARGS='-run=TestAccApiManagementSubscription_withApiId' TESTTIMEOUT='120m'
==> Checking that code complies with gofmt requirements...
==> Checking that Custom Timeouts are used...
==> Checking that acceptance test packages are used...
TF_ACC=1 go test ./azurerm/internal/services/apimanagement/api_management_subscription_resource_test.go -v -run=TestAccApiManagementSubscription_withApiId -timeout 120m -ldflags="-X=github.com/terraform-providers/terraform-provider-azurerm/version.ProviderVersion=acc"
2021/06/01 13:25:25 [DEBUG] not using binary driver name, it's no longer needed
2021/06/01 13:25:26 [DEBUG] not using binary driver name, it's no longer needed
=== RUN   TestAccApiManagementSubscription_withApiId
=== PAUSE TestAccApiManagementSubscription_withApiId
=== CONT  TestAccApiManagementSubscription_withApiId
--- PASS: TestAccApiManagementSubscription_withApiId (2670.30s)
PASS
ok      command-line-arguments  2672.300s

The scope attribute must be parsed to check if the scope is for a product, an api or for all apis. Probably the code can be better for the differentiation.

At the moment I assume the subscription is for all apis if neither product nor api id are configured.

[katbyte]

Thanks @patst - aside from one small comment which i will address now this LGTM 👍

[ghost]

This has been released in version 2.62.0 of the provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading. As an example:

provider "azurerm" {
    version = "~> 2.62.0"
}
# ... other configuration ...

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