data_factory_linked_service_sql_server: support key_vault_password

[allantargino]

fixes #6481

Following the same interface introduced at #9928, where we added key_vault_password property on azurerm_data_factory_linked_service_synapse to support passwords stored in Key Vault secret through an ADF linked service, this PR adds the same capability to azurerm_data_factory_linked_service_sql_server.

The following example

resource "azurerm_data_factory_linked_service_sql_server" "test" {
  name                = "SqlServerLinkedSvc"
  resource_group_name = azurerm_resource_group.test.name
  data_factory_name   = azurerm_data_factory.test.name
  connection_string = "Integrated Security=False;Data Source=test;Initial Catalog=test;User ID=test;"
  key_vault_password {
    linked_service_name = "KeyVaultLinkedSvc"
    secret_name         = "MySecret"
  }
}

produces the following Linked Service on ADF:

{
    "name": "SqlServerLinkedSvc",
    "type": "Microsoft.DataFactory/factories/linkedservices",
    "properties": {
        "annotations": [],
        "type": "SqlServer",
        "typeProperties": {
            "connectionString": "Integrated Security=False;Data Source=test;Initial Catalog=test;User ID=test;",
            "password": {
                "type": "AzureKeyVaultSecret",
                "store": {
                    "referenceName": "KeyVaultLinkedSvc",
                    "type": "LinkedServiceReference"
                },
                "secretName": "MySecret"
            }
        }
    }
}

[katbyte]

Thanks @allantargino - one small comment i've left inline and this should be good

[allantargino]

Hi @katbyte, following the refactor from #10114, I refactored this PR and solved conflicts with master.

[katbyte]

Thanks @allantargino - LGTM 👍

[ghost]

This has been released in version 2.43.0 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 = "~> 2.43.0"
}
# ... other configuration ...

[ghost]

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