Ensure web sockets are disabled for Azure App Service

Using Web Sockets for Azure App Service may introduce unknown vulnerabilities.

In Azure Console -

1. Open the Azure Portal and go to App Services.
2. Select the App service you wish to edit.
3. Select Configuration under Settings, then the General settings tab.
4. Under Platform Settings, set Web sockets to off.
5. Save.

In Terraform -

1. In the azurerm_app_service resource, set websockets_enabled to false.

References:
https://learn.microsoft.com/en-us/azure/app-service/
https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/app_service#websockets_enabled