kubernetes_cluster supports maintenance_config

[ms-henglu]

rewrite #12305, embed maintenance resource to kubernetes_cluster

=== RUN   TestAccKubernetesCluster_updateMaintenanceConfig
=== PAUSE TestAccKubernetesCluster_updateMaintenanceConfig
=== CONT  TestAccKubernetesCluster_updateMaintenanceConfig
--- PASS: TestAccKubernetesCluster_updateMaintenanceConfig (913.75s)

=== RUN   TestAccKubernetesCluster_basicMaintenanceConfig
=== PAUSE TestAccKubernetesCluster_basicMaintenanceConfig
=== CONT  TestAccKubernetesCluster_basicMaintenanceConfig
--- PASS: TestAccKubernetesCluster_basicMaintenanceConfig (910.13s)

=== RUN   TestAccKubernetesCluster_completeMaintenanceConfig
=== PAUSE TestAccKubernetesCluster_completeMaintenanceConfig
=== CONT  TestAccKubernetesCluster_completeMaintenanceConfig
--- PASS: TestAccKubernetesCluster_completeMaintenanceConfig(916.23s)

[katbyte]

THis is causing all tests to fail:

------- Stdout: -------
=== RUN   TestAccKubernetesCluster_privateClusterOnWithPrivateDNSZoneSubDomain
=== PAUSE TestAccKubernetesCluster_privateClusterOnWithPrivateDNSZoneSubDomain
=== CONT  TestAccKubernetesCluster_privateClusterOnWithPrivateDNSZoneSubDomain
    testcase.go:88: Step 1/1 error: Error running apply: exit status 1
        
        Error: retrieving Maintenance Configuration for Managed Kubernetes Cluster ("Cluster: (Managed Cluster Name \"acctestaks210730050729703273\" / Resource Group \"acctestRG-aks-210730050729703273\")"): containerservice.MaintenanceConfigurationsClient#Get: Failure responding to request: StatusCode=404 -- Original Error: autorest/azure: Service returned an error. Status=404 Code="NotFound" Message="Could not find the maintenance configuration: default in subscription: *******, resourceGroup: acctestRG-aks-210730050729703273, resourceName: acctestaks210730050729703273."
        
          with azurerm_kubernetes_cluster.test,
          on terraform_plugin_test.tf line 28, in resource "azurerm_kubernetes_cluster" "test":
          28: resource "azurerm_kubernetes_cluster" "test" {
        
--- FAIL: TestAccKubernetesCluster_privateClusterOnWithPrivateDNSZoneSubDomain (1021.31s)
FAIL

[ms-henglu]

@katbyte , Hi, I've updated the commit, could you please take another look? Thanks!

[ms-henglu]

@katbyte , thanks! I've added a commit to rename the fields according to your suggestions.

[katbyte]

thanks @ms-henglu - LGTM 🚀

[github-actions]

This functionality has been released in v2.71.0 of the Terraform Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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