Add support for app_service_plan_id in Windows/Linux slot resources

[NikRimington]

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Description

The azurerm_windows_web_app_slot and azurerm_linux_web_app_slot are designed to replace the azurerm_app_service_slot however they both appear to be missing a useful bit of functionality. They do not allow for slots to be created against different service plans than the main web app.

The legacy resource had the following option app_service_plan_id which meant that your slot's app service plan could differ from the main web apps. It would be great to see this added back in.

New or Affected Resource(s)/Data Source(s)

azurerm_windows_web_app_slot, azurerm_linux_web_app_slot

Potential Terraform Configuration

resource "azurerm_windows_web_app_slot" "example" {
  name            = "example-slot"
  app_service_id  = azurerm_windows_web_app.example.id
  service_plan_id = azurerm_app_service_plan.alternate-plan.id

  site_config {}
}

References

No response