feat(iaas): min/max acc tests (#811)

* feat(iaas): security group min/max acc test

* feat(iaas): image min/max acc test

* feat(iaas): KeyPair min/max acc test

* feat(iaas): Network area min/max acc test
- fix: wrong atLeast-validator for `minimum_prefix_length`

* feat(iaas): Network min/max acc test

* feat(iaas): Volume min/max acc test
- fix: volume update doesn't work if no name was defined
- fix: volume.server_id can not be set
- fix: error message volume.size returns value but was null

* feat(iaas): Network interfaces min/max acc test

* feat(iaas): Affinity groups acc test

* feat(iaas): Server min/max acc test
- stackit_server_volume_attach
- stackit_server_network_interface_attach
- stackit_server_service_account_attach

* fix(iaas): acc test
- image: fix read of Config.VirtioScsi
- keypair: add missing RequiresReplace() for name
- server: add missing UserData read in datasource and resource

* feat(iaas): public ip acc test
- fix: when a nic is assigned to a public ip, the field network_interface_id leads to recreation

stackit/internal/services/iaas/publicip/resource.go

@@ -140,6 +140,7 @@ func (r *publicIpResource) Schema(_ context.Context, _ resource.SchemaRequest, r
 			"network_interface_id": schema.StringAttribute{
 				Description: "Associates the public IP with a network interface or a virtual IP (ID). If you are using this resource with a Kubernetes Load Balancer or any other resource which associates a network interface implicitly, use the lifecycle `ignore_changes` property in this field to prevent unintentional removal of the network interface due to drift in the Terraform state",
 				Optional:    true,
+				Computed:    true,
 				Validators: []validator.String{
 					validate.UUID(),
 					validate.NoSeparator(),