Merge pull request #51372 from mtaufen/feature-gate-file

Automatic merge from submit-queue (batch tested with PRs 49971, 51357, 51616, 51649, 51372)

Separate feature gates for dynamic kubelet config vs loading from a file

This makes it so these two features can be turned on independently, rather than bundling both under dynamic kubelet config.

fixes: #51664

```release-note
NONE
```

pkg/kubelet/kubeletconfig/controller.go

@@ -78,9 +78,9 @@ type Controller struct {
 // If the `initConfigDir` is an empty string, skips trying to load the init config.
 // If the `dynamicConfigDir` is an empty string, skips trying to load checkpoints or download new config,
 // but will still sync the ConfigOK condition if you call StartSync with a non-nil client.
-func NewController(initConfigDir string,
-	dynamicConfigDir string,
-	defaultConfig *kubeletconfig.KubeletConfiguration) (*Controller, error) {
+func NewController(defaultConfig *kubeletconfig.KubeletConfiguration,
+	initConfigDir string,
+	dynamicConfigDir string) (*Controller, error) {
 	var err error
 
 	fs := utilfs.DefaultFs{}