azurerm_data_factory_linked_service_azure_file_storage: Add support for key_vault_password

[favoretti]

Fixes #11408

$ TF_ACC=1 go test -v ./azurerm/internal/services/datafactory -run=TestAccDataFactoryLinkedServiceAzureFileStorage_KeyVaultReference -timeout=1000m
2021/04/22 13:22:03 [DEBUG] not using binary driver name, it's no longer needed
2021/04/22 13:22:03 [DEBUG] not using binary driver name, it's no longer needed
=== RUN   TestAccDataFactoryLinkedServiceAzureFileStorage_KeyVaultReference
=== PAUSE TestAccDataFactoryLinkedServiceAzureFileStorage_KeyVaultReference
=== CONT  TestAccDataFactoryLinkedServiceAzureFileStorage_KeyVaultReference
--- PASS: TestAccDataFactoryLinkedServiceAzureFileStorage_KeyVaultReference (335.45s)
PASS
ok  	github.com/terraform-providers/terraform-provider-azurerm/azurerm/internal/services/datafactory	337.385s

[favoretti]

[katbyte]

Thanks @favoretti - LGTM 👍

[ghost]

This has been released in version 2.57.0 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 = "~> 2.57.0"
}
# ... other configuration ...

[github-actions]

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