add doc and test to support function app slot vnet connetion - "azurerm_app_service_slot_virtual_network_swift_connection"

[njuCZ]

fix #8048

because app service and function app are one rest api, resource "azurerm_app_service_slot_virtual_network_swift_connection" also applies to "azurerm_function_app_slot". this PR add test and doc for function app part

[tombuildsstuff]

hey @njuCZ

Thanks for this PR :)

Taking a look through this mostly LGTM - if we can handle the errors here then this otherwise LGTM 👍

Thanks!

[tombuildsstuff]

whilst these are shared today - longer-term we'll likely want to introduce an alias for the function app resources

this isn't a big deal right now, and these do technically work - but we'll probably look to add aliases for these resources in 3.0 - since (based on Github issues) folks appear to be unaware these are the same thing

[njuCZ]

@tombuildsstuff I have added back the error check, could you please have a look again?

[tombuildsstuff]

LGTM - thanks for pushing those changes @njuCZ

[tombuildsstuff]

Tests pass:

[ghost]

This has been released in version 2.25.0 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 = "~> 2.25.0"
}
# ... other configuration ...

[ghost]

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