azurerm_kubernetes_cluster: Support update of azure_rbac_enabled

[aristosvo]

Remove ForceNew from azure_rbac_enabled as feature is GA.

Acceptance Tests

❯ make acctests SERVICE='containers' TESTARGS='-run=TestAccKubernetesCluster_roleBasedAccessControlAzure'
==> 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 -v ./azurerm/internal/services/containers -run=TestAccKubernetesCluster_roleBasedAccessControlAzure -timeout 180m -ldflags="-X=github.com/terraform-providers/terraform-provider-azurerm/version.ProviderVersion=acc"
2021/06/01 12:51:01 [DEBUG] not using binary driver name, it's no longer needed
2021/06/01 12:51:03 [DEBUG] not using binary driver name, it's no longer needed
=== RUN   TestAccKubernetesCluster_roleBasedAccessControlAzure
=== PAUSE TestAccKubernetesCluster_roleBasedAccessControlAzure
=== CONT  TestAccKubernetesCluster_roleBasedAccessControlAzure
--- PASS: TestAccKubernetesCluster_roleBasedAccessControlAzure (1354.18s)
PASS
ok      github.com/terraform-providers/terraform-provider-azurerm/azurerm/internal/services/containers     1358.813s

[mbfrahry]

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 ...

[github-actions]

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