golangci-lint: enable and fix thelper linter

Signed-off-by: Matthieu MOREL <matthieu.morel35@gmail.com>

pkg/controller/backup_deletion_controller_test.go

@@ -77,6 +77,7 @@ func defaultTestDbr() *velerov1api.DeleteBackupRequest {
 }
 
 func setupBackupDeletionControllerTest(t *testing.T, req *velerov1api.DeleteBackupRequest, objects ...runtime.Object) *backupDeletionControllerTestData {
+	t.Helper()
 	var (
 		fakeClient        = velerotest.NewFakeControllerRuntimeClient(t, append(objects, req)...)
 		volumeSnapshotter = &velerotest.FakeVolumeSnapshotter{SnapshotsTaken: sets.NewString()}

pkg/controller/backup_repository_controller_test.go

@@ -38,6 +38,7 @@ import (
 const testMaintenanceFrequency = 10 * time.Minute
 
 func mockBackupRepoReconciler(t *testing.T, mockOn string, arg interface{}, ret interface{}) *BackupRepoReconciler {
+	t.Helper()
 	mgr := &repomokes.Manager{}
 	if mockOn != "" {
 		mgr.On(mockOn, arg).Return(ret)