azurerm_api_management[_custom_domain] - fix certificate update behaviour

[sreallymatt]

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Description

Cause of this issue was due to the behaviour of O+C properties. Terraform returns the old state value for key_vault_id, which would then overwrite the new value of key_vault_certificate_id preventing cert updates when using this field.

• fixes update functionality for *.key_vault_certificate_id in both resources by using RawConfig to determine whether key_vault_id was set.
• adds additional tests as this regression was previously not caught

PR Checklist

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Changes to existing Resource / Data Source

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Testing

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4.0 tests:
single new failure was due to hitting a SKU quota limit

5.0 tests:

Change Log

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

• azurerm_resource - support for the thing1 property [GH-00000]

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 #31450

AI Assistance Disclosure

• AI Assisted - This contribution was made by, or with the assistance of, AI/LLMs

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the provider.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

Note

If this PR changes meaningfully during the course of review please update the title and description as required.

[teowa]

Hi @sreallymatt , thanks for the PR, this fixes #31450

[mbfrahry]

LGTM

[github-actions]

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