managed_disk: Option to configure tier on managed disks

[aristosvo]

Fixes #11585

Tasks:

• Implement the option
• Document the option
• Run existing Acceptance tests (3 existing failures, regarding KV problems)
• Create an Acceptance test
• Validate configuration (option only available for Premium SSDs)

[aristosvo]

New acctest, testing both setting and updating of tier option:

❯ make acctests SERVICE='compute' TESTARGS='-run=TestAccManagedDisk_attachedTierUpdate'
==> 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/compute -run=TestAccManagedDisk_attachedTierUpdate -timeout 180m -ldflags="-X=github.com/terraform-providers/terraform-provider-azurerm/version.ProviderVersion=acc"
2021/05/08 14:57:51 [DEBUG] not using binary driver name, it's no longer needed
2021/05/08 14:57:52 [DEBUG] not using binary driver name, it's no longer needed
=== RUN   TestAccManagedDisk_attachedTierUpdate
=== PAUSE TestAccManagedDisk_attachedTierUpdate
=== CONT  TestAccManagedDisk_attachedTierUpdate
--- PASS: TestAccManagedDisk_attachedTierUpdate (691.37s)
PASS
ok      github.com/terraform-providers/terraform-provider-azurerm/azurerm/internal/services/compute   694.997s

[katbyte]

Thanks @aristosvo - LGTM 👍

[ghost]

This has been released in version 2.59.0 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 = "~> 2.59.0"
}
# ... other configuration ...

[github-actions]

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