Add new gofail enablement for "CrashAfterAddMember".

go.mod

@@ -13,6 +13,7 @@ require (
 	go.etcd.io/etcd/client/pkg/v3 v3.5.17
 	go.etcd.io/etcd/client/v3 v3.5.17
 	go.etcd.io/etcd/server/v3 v3.5.17
+	go.etcd.io/gofail v0.2.0
 	go.uber.org/zap v1.27.0
 	k8s.io/api v0.32.1
 	k8s.io/apimachinery v0.32.1
@@ -86,7 +87,6 @@ require (
 	go.etcd.io/etcd/client/v2 v2.305.17 // indirect
 	go.etcd.io/etcd/pkg/v3 v3.5.17 // indirect
 	go.etcd.io/etcd/raft/v3 v3.5.17 // indirect
-	go.etcd.io/gofail v0.2.0 // indirect
 	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.53.0 // indirect
 	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.53.0 // indirect
 	go.opentelemetry.io/otel v1.28.0 // indirect

test/e2e_failpoint/scale_failpoint_test.go

@@ -28,6 +28,7 @@ import (
 	. "github.com/onsi/gomega"
 
 	"go.etcd.io/etcd-operator/test/utils"
+	gofail "go.etcd.io/gofail/runtime"
 )
 
 // namespace where the project is deployed in
@@ -43,6 +44,8 @@ const metricsServiceName = "etcd-operator-controller-manager-metrics-service"
 const metricsRoleBindingName = "etcd-operator-metrics-binding"
 
 var _ = Describe("Manager", Ordered, func() {
+	// Temp
+	gofail.Enable("CrashAfterAddMember", `return("hello")`)
 	var controllerPodName string
 
 	// Before running the tests, set up the environment by creating the namespace,