Graduating Windows GMSA support to beta

Concerns from alpha-phase reviews have been addressed in
kubernetes#80320
and
kubernetes#82109
and early adopters have given positive feedback; so it seems there are
no blockers to graduate GMSA support to beta.

This patch also enables GMSA support by default, mainly for the sake of
making it easier for cluster admins to use, as well as for e2e tests in
nightly builds.

Signed-off-by: Jean Rouge <[email protected]>

Author: wk8

pkg/features/kube_features.go

@@ -417,6 +417,7 @@ const (
 
 	// owner: @wk8
 	// alpha: v1.14
+	// beta: v1.16
 	//
 	// Enables GMSA support for Windows workloads.
 	WindowsGMSA featuregate.Feature = "WindowsGMSA"
@@ -551,7 +552,7 @@ var defaultKubernetesFeatureGates = map[featuregate.Feature]featuregate.FeatureS
 	ProcMountType:                       {Default: false, PreRelease: featuregate.Alpha},
 	TTLAfterFinished:                    {Default: false, PreRelease: featuregate.Alpha},
 	KubeletPodResources:                 {Default: true, PreRelease: featuregate.Beta},
-	WindowsGMSA:                         {Default: false, PreRelease: featuregate.Alpha},
+	WindowsGMSA:                         {Default: true, PreRelease: featuregate.Beta},
 	WindowsRunAsUserName:                {Default: false, PreRelease: featuregate.Alpha},
 	ServiceLoadBalancerFinalizer:        {Default: true, PreRelease: featuregate.Beta},
 	LocalStorageCapacityIsolationFSQuotaMonitoring: {Default: false, PreRelease: featuregate.Alpha},