azurerm_kubernetes_cluster - remove subnet lock

[ms-henglu]

This PR removes the subnet lock. According to https://github.com/Azure/AKS/releases/tag/2024-09-18, the race condition issue is fixed. I also kept the test to verify the fix.

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Description

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Changes to existing Resource / Data Source

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Testing

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=== RUN   TestAccKubernetesClusterNodePool_virtualNetworkOwnershipRaceCondition
=== PAUSE TestAccKubernetesClusterNodePool_virtualNetworkOwnershipRaceCondition
=== CONT  TestAccKubernetesClusterNodePool_virtualNetworkOwnershipRaceCondition
--- PASS: TestAccKubernetesClusterNodePool_virtualNetworkOwnershipRaceCondition (1330.64s)
PASS

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 #0000

Note

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

[stephybun]

Thanks @ms-henglu. The test looks good, once the surrounding code has been removed as well this should be good to go.

[stephybun]

We can remove the entire block that this is nested in i.e. from line 415-427 since without the locks these statements don't have any purpose.

[ms-henglu]

Hi @stephybun - These statements are still used in other places like https://github.com/hashicorp/terraform-provider-azurerm/blob/main/internal/services/containers/kubernetes_cluster_node_pool_resource.go#L674

[stephybun]

Thanks @ms-henglu LGTM 🍄

[github-actions]

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