Fix SetFeatureGateDuringTest handling of Parallel tests

Stop using defer as parallel subtest will might result in main test
finishing before subtest.

Fatal when same flag is set twice.

Kubernetes-commit: 9fcf279e2b91e7549190a433373f256fb5aebe85

pkg/endpoints/handlers/responsewriters/writers_test.go

@@ -53,8 +53,6 @@ func TestSerializeObjectParallel(t *testing.T) {
 	type test struct {
 		name string
 
-		compressionEnabled bool
-
 		mediaType  string
 		out        []byte
 		outErrs    []error
@@ -67,10 +65,9 @@ func TestSerializeObjectParallel(t *testing.T) {
 	}
 	newTest := func() test {
 		return test{
-			name:               "compress on gzip",
-			compressionEnabled: true,
-			out:                largePayload,
-			mediaType:          "application/json",
+			name:      "compress on gzip",
+			out:       largePayload,
+			mediaType: "application/json",
 			req: &http.Request{
 				Header: http.Header{
 					"Accept-Encoding": []string{"gzip"},
@@ -85,6 +82,7 @@ func TestSerializeObjectParallel(t *testing.T) {
 			},
 		}
 	}
+	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.APIResponseCompression, true)()
 	for i := 0; i < 100; i++ {
 		ctt := newTest()
 		t.Run(ctt.name, func(t *testing.T) {
@@ -94,7 +92,6 @@ func TestSerializeObjectParallel(t *testing.T) {
 				}
 			}()
 			t.Parallel()
-			defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.APIResponseCompression, ctt.compressionEnabled)()
 
 			encoder := &fakeEncoder{
 				buf:  ctt.out,

pkg/storage/cacher/cacher_test.go

@@ -173,6 +173,8 @@ func TestList(t *testing.T) {
 }
 
 func TestListWithListFromCache(t *testing.T) {
+	// TODO(https://github.com/etcd-io/etcd/issues/17507): Remove skip.
+	t.Skip("This test flakes flakes due to https://github.com/etcd-io/etcd/issues/17507")
 	defer featuregatetesting.SetFeatureGateDuringTest(t, utilfeature.DefaultFeatureGate, features.ConsistentListFromCache, true)()
 	ctx, cacher, server, terminate := testSetupWithEtcdServer(t)
 	t.Cleanup(terminate)