test(Lb/Backend): Removing unused ip declaration from the first step (#842)

In the first step, `scaleway_instance_ip.ip02` is not used so let's remove it.
In fact, cassette is not able to distinguish the HTTP calls for `resource scaleway_instance_ip ip01 {}` and `resource
scaleway_instance_ip ip02 {}` as they are identicals making the acceptance tests failing

Author: jeansebastienh

scaleway/resource_instance_server_test.go

@@ -599,7 +599,6 @@ func TestAccScalewayInstanceServer_WithReservedIP(t *testing.T) {
 			{
 				Config: `
 					resource "scaleway_instance_ip" "first" {}
-					resource "scaleway_instance_ip" "second" {}
 					resource "scaleway_instance_server" "base" {
 						image = "ubuntu_focal"
 						type  = "DEV1-S"

scaleway/resource_lb_backend_test.go

@@ -27,7 +27,6 @@ func TestAccScalewayLbBackend_Basic(t *testing.T) {
 					}
 
 					resource scaleway_instance_ip ip01 {}
-					resource scaleway_instance_ip ip02 {}
 
 					resource scaleway_lb_backend bkd01 {
 						lb_id = scaleway_lb.lb01.id
@@ -72,7 +71,7 @@ func TestAccScalewayLbBackend_Basic(t *testing.T) {
 						forward_port_algorithm = "leastconn"
 						sticky_sessions = "cookie"
 						sticky_sessions_cookie_name = "session-id"
-						server_ips = [ scaleway_instance_ip.ip02.address ]
+						server_ips = [scaleway_instance_ip.ip01.address , scaleway_instance_ip.ip02.address ]
 						proxy_protocol = "none"
 						timeout_server = "1s"
 						timeout_connect = "2.5s"
@@ -86,7 +85,8 @@ func TestAccScalewayLbBackend_Basic(t *testing.T) {
 				`,
 				Check: resource.ComposeTestCheckFunc(
 					testAccCheckScalewayLbBackendExists(tt, "scaleway_lb_backend.bkd01"),
-					resource.TestCheckResourceAttrPair("scaleway_lb_backend.bkd01", "server_ips.0", "scaleway_instance_ip.ip02", "address"),
+					resource.TestCheckResourceAttrPair("scaleway_lb_backend.bkd01", "server_ips.0", "scaleway_instance_ip.ip01", "address"),
+					resource.TestCheckResourceAttrPair("scaleway_lb_backend.bkd01", "server_ips.1", "scaleway_instance_ip.ip02", "address"),
 					resource.TestCheckResourceAttr("scaleway_lb_backend.bkd01", "health_check_delay", "10s"),
 					resource.TestCheckResourceAttr("scaleway_lb_backend.bkd01", "health_check_timeout", "15s"),
 					resource.TestCheckResourceAttr("scaleway_lb_backend.bkd01", "health_check_port", "81"),