Flip SeparateCacheWatchRPC feature gate to false and deprecate it.

Watch requests to etcd are mapped to a single stream that has a limited throughput.
By opening a lot of concurrent watch requests to single resource, users
could starve other watches from getting any events.

Separating the RPC was meant to protect the watch opened by cache.
However, as we are no longer planning to allow users to open watch directly to etcd,
the flag is not needed.

pkg/features/versioned_kube_features.go

@@ -325,6 +325,7 @@ var defaultVersionedKubernetesFeatureGates = map[featuregate.Feature]featuregate
 
 	genericfeatures.SeparateCacheWatchRPC: {
 		{Version: version.MustParse("1.28"), Default: true, PreRelease: featuregate.Beta},
+		{Version: version.MustParse("1.33"), Default: false, PreRelease: featuregate.Deprecated},
 	},
 
 	genericfeatures.StorageVersionAPI: {

staging/src/k8s.io/apiserver/pkg/features/kube_features.go

@@ -364,6 +364,7 @@ var defaultVersionedKubernetesFeatureGates = map[featuregate.Feature]featuregate
 
 	SeparateCacheWatchRPC: {
 		{Version: version.MustParse("1.28"), Default: true, PreRelease: featuregate.Beta},
+		{Version: version.MustParse("1.33"), Default: false, PreRelease: featuregate.Deprecated},
 	},
 
 	StorageVersionAPI: {

test/featuregates_linter/test_data/versioned_feature_list.yaml

@@ -1150,6 +1150,10 @@
     lockToDefault: false
     preRelease: Beta
     version: "1.28"
+  - default: false
+    lockToDefault: false
+    preRelease: Deprecated
+    version: "1.33"
 - name: SeparateTaintEvictionController
   versionedSpecs:
   - default: true