Microsoft.Web/hostingEnvironments@latest missing identity properties

When using the Microsoft.Web/hostingEnvironments@latest API, we are unable to update existing hosting environments, like an Azure Service Environment v3 to utilize either a SystemAssigned or UserAssigned managed identity. For us, this started with Terraform provider for [ASEv3](https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/app_service_environment_v3). We then realized that the properties were missing from the Azure API and Swagger documentation when we tried to utilize the Terraform provider for [AZAPI](https://registry.terraform.io/providers/azure/azapi/latest/docs/resources/azapi_update_resource).

These properties are already available at the web app level in Microsoft.Web/sites.

Related [issue.](https://github.com/hashicorp/terraform-provider-azurerm/issues/18417)

Start by locating the Microsoft.Web/hostingEnvironments@latest API and Swagger specification, then compare its identity properties with Microsoft.Web/sites. The related Terraform ASEv3 and AZAPI issues provide context; done means the hosting environment schema documents SystemAssigned and UserAssigned managed identity properties and supports updating existing environments.

Written by the indexing model from the issue text.