The SKU name property setting value of Automation Account resource doesn't take effect

After testing, seems[ the SKU name](https://github.com/Azure/azure-rest-api-specs/blob/7f530e3727f746e26f5b5ece8a5874daf10cc56f/specification/automation/resource-manager/Microsoft.Automation/stable/2019-06-01/account.json#L535) property doesn't take effect while creating [this resource ](https://github.com/Azure/azure-rest-api-specs/blob/7f530e3727f746e26f5b5ece8a5874daf10cc56f/specification/automation/resource-manager/Microsoft.Automation/stable/2019-06-01/account.json#L96) with the SKU name I specified. No matter what value is specified to the SKU name, the response body always return `Basic`. The response properties contains `Basic` when setting it to `Free`.

Start with specification/automation/resource-manager/Microsoft.Automation/stable/2019-06-01/account.json, especially the SKU definition near line 535 and the account resource near line 96. Reproduce creation with a non-Basic SKU such as Free, compare the requested value with the response, and determine whether the specification or service behavior needs correction.

Written by the indexing model from the issue text.