data.azurerm_api_management_subscription : fixed a failure that occurred when reading the built-in subscription

[sinbai]

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Description

When an API Management (APIM) service is created, a built-in subscription named master is automatically provisioned. I assume that users should not manage this built-in subscription via the AzureRM Provider resource azurerm_api_management_subscription. However, it should be possible for users to read and reference it through the data source data.azurerm_api_management_subscription.

Currently, the implementation of data.azurerm_api_management_subscription does not account for the built-in master subscription, which leads to issue #30579 during read operations, so submitted this PR to fix it.

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have checked if my changes close any open issues. If so please include appropriate closing keywords below.
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  For example: “resource_name_here - description of change e.g. adding property new_property_name_here”

Changes to existing Resource / Data Source

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Testing

• My submission includes Test coverage as described in the Contribution Guide and the tests pass. (if this is not possible for any reason, please include details of why you did or could not add test coverage)

PASS: TestAccDataSourceApiManagementSubscription_basic (213.73s)

Change Log

Below please provide what should go into the changelog (if anything) conforming to the Changelog Format documented here.

• data.azurerm_api_management_subscription : fixed a failure that occurred when reading the built-in subscription [Data source azurerm_api_management_subscription fails for built-in subscriptions #30579]

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

Fixes #30579